The invention relates to an electric motor transmission structure, particularly relates to an electric motor transmission structure with a function of overload protection, and belongs to the technical field of electric motors. The electric motor transmission structure comprises an electric motor, wherein a motor gear is nested on an electric motor output shaft, and the lower end of the electric motor output shaft is connected with a locking block through a cylindrical pin; an inner locking gasket and an outer locking gasket are nested on the electric output shaft, the inner locking gasket is located on the inner side of the motor gear, and the outer locking gasket is located between the motor gear and the locking block; and a spring is nested at the upper end of the electric motor output shaft and compresses the inner locking gasket, the motor gear, the outer locking gasket and the locking block. The electric motor transmission structure is simple, compact and reasonable in structure, suitable for batch production, small in size, convenient to assemble and good in product consistency, and doesn't occupy additional space; and on the condition that normal work of the electric motor is guaranteed, the overload protection function is added, so that the motor cannot be burnt during overloading.