The invention discloses a hybrid power system which comprises an engine, a first motor, a second motor, a first clutch, a second clutch, a planetary gear train, an inner input shaft, an outer input shaft, an output shaft system and a differential mechanism. According to the system, a gear ring, the two clutches and the motor are integrated and driven so that a space is greatly saved, and power division can be effectively controlled; and the system is diversified in driving mode and more efficient in energy application. And meanwhile, the motor performs auxiliary gear shifting on a driving power source, power interruption is avoided, and a dynamic property of the system is improved. The engine can be charged under the working condition that energy needs to be consumed, and energy saving isachieved.