The invention relates to a kind series-wound brake system of mixed power electromotion vehicle which belongs to the technique of mixed power vehicle field. The system includes callback brake subsystem and hydraulic pressure brake subsystem. The callback brake subsystem consists of an a an an engine, an ISG motor, an manual transmission ,the main decelerator all connected with mechanical devices, and the electronic control unit connected to the circuitry of the ISG motor the battery and the converser. The hydraulic pressure brake subsystem consists of a brake pedal, the main cylinder connected to the brake pedal, two set of pressure adjusting devices connected to the main cylinder through the oil duct, the ABS components group, the oil container and the jar of the wheels each connected through electrocircuit with the two set of pressure adjusting devices, the ABS components group, and the rotate speed sensor connected to the control unit. The invention bring forward the mixed power vehicle's series-wound brake system's structure and makes the mixed power vehicle recycle the brake power possible and highly improved the fuel economy.