Air bed

1. An air bed, comprising: an upper sheet, a lower sheet, a left side sheet, a right side sheet, first structural pull belts and second structural pull belts, wherein the upper sheet, the lower sheet, the left side sheet and the right side sheet define one air chamber;

the upper sheet and the lower sheet are connected with each other at the front and the back of the air bed, to form a front side wall of the air bed at a front end, and a rear side wall of the air bed at a rear end, and each inner edge at a respective joint between the upper sheet and the lower sheet is provided with the respective first structural pull belt;

the left side sheet is connected with the upper sheet and the lower sheet to form a left side wall of the air bed, and an inner edge at a left joint is provided with the respective second structural pull belt; and

the right side sheet is connected with the upper sheet and the lower sheet to form a right side wall of the air bed, and an inner edge at a right joint is provided with the respective second structural pull belt,

wherein the air bed comprises connection bodies, the left side sheet and the right side sheet are each provided with the respective connection body, a lower edge of the second structural pull belt connected with the upper sheet is connected with an upper edge of the respective connection body, and an upper edge of the second structural pull belt connected with the lower sheet is connected with a lower edge of the respective connection body.

2. The air bed according to claim 1 , wherein an upper edge and a lower edge inside the left joint are each provided with the second structural pull belt.

3. The air bed according to claim 1 , wherein an upper edge and a lower edge inside the right joint are each provided with the second structural pull belt.

4. The air bed according to claim 1 , wherein each connection body is a sheet and each connection body is attached and fixed to the left side sheet or the right side sheet.

5. The air bed according to claim 1 , wherein the second structural pull belts located on the same side which are up-down distributed are integrally molded with the respective connection body.

6. The air bed according to claim 1 , wherein each connection body is provided with a plurality of annular openings arranged at intervals, and a support rib is arranged between each two adjacent annular openings.

7. The air bed according to claim 1 , wherein each connection body is formed in an “I” shape, and two long strips of the connection body are connected with the two second structural pull belts on the same side, respectively.

8. The air bed according to claim 7 , wherein each connection body comprises a plurality of short strips located between the two long strips, and the plurality of short strips are arranged at intervals in an extending direction of the long strips.

9. The air bed according to claim 1 , wherein an upper edge and a lower edge inside the front of the air bed are each provided with the first structural pull belt.

10. The air bed according to claim 1 , wherein an upper edge and a lower edge inside the back of the air bed are each provided with the first structural pull belt.

11. The air bed according to claim 1 , wherein an included angle is formed between each first structural pull belt and the upper sheet.

12. The air bed according to claim 1 , wherein an included angle is formed between each first structural pull belt and the lower sheet.

13. The air bed according to claim 1 , wherein the air bed further comprises a shaping limit pull belt, wherein the shaping limit pull belt is connected between the upper sheet and the lower sheet and located inside the air chamber.

14. The air bed according to claim 12 , wherein the shaping limit pull belt is in an annular structure.

15. The air bed according to claim 12 , wherein the shaping limit pull belt comprises two opposite connecting walls, wherein the two connecting walls are attached and fixed to the upper sheet and the lower sheet, respectively.

16. The air bed according to claim 12 , wherein a plurality of shaping limit pull belts are provided and are arranged in an array inside the air chamber.

17. The air bed according to claim 12 , wherein each shaping limit pull belt is connected with the upper sheet by bonding or sewing.

18. The air bed according to claim 12 , wherein each shaping limit pull belt is connected with the lower sheet by bonding or sewing.