Trolley convenient to load and unload

The utility model discloses a trolley convenient to assemble and disassemble, and relates to the field of trolleys. The electric vehicle comprises a bottom plate, the top of the bottom plate is provided with a handlebar and an expansion assembly, the bottom of the bottom plate is provided with a brake assembly, and the brake assembly comprises a linkage rod and a movable frame. One end of the brake rod pushes the linkage rod to overcome the elastic force of the first spring to move downwards, the wedge-shaped block moves downwards to extrude the movable frame, the movable frame overcomes the elastic force of the second spring to push the brake part to move, so that the brake part is in contact with the wheel, the friction force of the wheel is increased, the rotating speed of the wheel is slowed down, and the brake function is achieved; when stone needs to be loaded and unloaded, a worker holds and presses the brake rod to a pole, then the positioning pin is inserted into the positioning groove, at the moment