The invention relates to a driving motor with a function of differential speed output, which consists of a driving motor shell, a water cooling system, a differential speed output power system and a differential speed measuring device. The driving motor can be used in the field of special transport vehicle driving or in the field of engineering application needing two-end differential speed output. The driving motor adopts the differential speed output power system which is positioned inside the motor, outputs the differential speed from two axial ends of the motor and achieves the differential speed output of the two output ends according to load demands. The driving motor has the advantages of achieving the differential speed output in two directions by using one motor, saving space and simplifying a driving system. The lubrication of a differential mechanism adopts wet type lubrication, and the differential mechanism is separated from a rotor chamber of the driving motor. By adopting the water cooling system which has high efficiency, high reliability and low environmental requirements, the driving motor can adapt to severe environments with high temperature, high humidity and the like.