Static hydraulic stepless speed change device

The invention relates to a speed change device, in particular to a static hydraulic stepless speed change device, and belongs to the technical field of speed change devices. The static hydraulic stepless speed change device comprises a shell body, a valve body, a motor main shaft and a pump main shaft, a rocking frame, a pump inclined plate and a pump return stroke plate are arranged between the inner side wall of the shell body and a pump cylinder body in sequence, a pump ball hinge, a pump roller pin and a pump spring are arranged between the pump main shaft and the pump cylinder body in sequence, the pump spring is used for pressing the pump ball hinge to the pump return stroke plate through the pump roller pin, a pump sliding shoe is arranged between the pump inclined plate and the pump return stroke plate, the pump sliding shoe head is tightly pressed on the pump inclined plate through the pump return stroke plate, the front end of the pump sliding shoe is connected with a pump plunger, the valve body is