The present invention relates to automobile technology and is one series parallel mixed power system, which includes engine, auxiliary clutch, main motor, main clutch, gear box, belt wheel clutch, belt wheel motor, front belt wheel system, engine fitting system, power cell, auxiliary cell, motor drive controller, high voltage safety controller, power cell controller, DC converter, vehicle controller, engine controller, the first half axis and the second half axis. The belt wheel motor driving the belt wheel is connected via a clutch to the engine and can drive the engine fitting system independently. The main motor is connected via an auxiliary clutch to the engine and connected via a main clutch to the input shaft of the gear box. The present invention has simple structure, compact configuration, low cost, optimized running efficiency, effective braking energy feedback and other advantages.