Multi-module assembling and locking structure of speed reducer

The invention discloses a speed reducer multi-module assembling and locking structure, and relates to the technical field of speed reducers, the speed reducer multi-module assembling and locking structure comprises a speed reducer body and a belt pulley, the input end of the speed reducer body is fixedly provided with a connecting shaft, the output end of the speed reducer body is fixedly provided with a transmission shaft, and one end of the speed reducer body is provided with a locking mechanism; fixing structures are arranged on the two sides of the speed reducer body. According to the device, errors can be prevented when the belt pulley is assembled, a speed reducer body is prevented from being damaged, meanwhile, the belt pulley can be stably fixed to the outer wall of the transmission shaft, the belt pulley is prevented from shaking when the transmission shaft rotates, and the belt pulley and the transmission shaft can stably rotate together; the speed reducer has the advantages of preventing influence