Frame structure and sitting draw-bar box

The utility model provides a vehicle frame structure and a sitting type draw-bar box, and belongs to the field of draw-bar boxes, the vehicle frame structure comprises a vehicle frame body and a rearsupport which is rotatably connected with the vehicle frame body through a connecting part, and the connecting part is provided with a limiting part which is fixed with a rotating key so as to enablethe limiting part to move downwards synchronously when the rotating key is stressed and pressed down; the limiting clamping groove is used for allowing the limiting part to be clamped in so as to limit the rotation of the rear bracket; the arc-shaped sliding groove is communicated with the limiting clamping groove; and when the rotary key is stressed to be pressed downwards, the limiting part moves downwards to the arc-shaped sliding groove. When the frame mechanism is used, after the rotary key is pressed, the rear support can be automatically closed, the rear support does not need to be folded towards the inner side