Speed change device of winding car

The speed change device comprises a rocking handle, a shell and a rotating shaft, a first gear, a second gear, a third gear and a fourth gear are arranged in the shell, one end of the rocking handle is fixedly connected with the end face of the first gear, the first gear is meshed with the second gear, and the end face of the second gear is fixedly connected with the end face of the third gear. The third gear is meshed with the fourth gear, one end of the rotating shaft sequentially penetrates through the rocking handle, the first gear, the fourth gear and the shell and extends outwards, the rotating shaft is installed on the first gear through a bearing, and the rotating shaft is sleeved with the fourth gear; the gear rings of the first gear and the third gear are larger than those of the second gear and the fourth gear, the rocking handle drives the first gear to rotate, the first gear drives the second gear to rotate, the third gear rotates along with the first gear and then drives the fourth gear to rotat