Dual-drive speed reducer

The utility model relates to a dual-drive speed reducer. The dual-drive speed reducer comprises a box body, wherein an output shaft is arranged on the middle portion of the box body. The dual-drive speed reducer is characterized in that the left side of the box body and the right side of the box body are respectively provided with a left input shaft and a right input shaft, wherein the left input shaft is driven onto the output shaft through a left speed changing gear set, and the right input shaft is driven to the output shaft through a right speed changing gear set. By the adoption of the dual-drive speed reducer, the phenomenon that one shaft can be input, and after the one shaft passes two drive chains, two shafts are output can be resolved, a structure of single counter gear transmission is adopted in gear transmission of the input shaft, transmission capacity of an input gear is improved, and the problem that a single pinion drives a left gear and a right gear to rotate so that two faces are under stres