Power driving system of electric vehicle

The utility model provides a power driving system of an electric vehicle, which comprises a motor and a gearbox mounted in a casing. An input driving gear of the gearbox is meshed with an input driven gear of the gearbox, an output driven gear is meshed with an output driving gear, and the input driven gear and the output driving gear are arranged at two ends of an intermediate shaft respectively. The power driving system is characterized in that an output shaft of the motor is coaxial with a first input shaft, a control unit, a first electromagnetic clutch and a second electromagnetic clutch are additionally arranged, the intermediate shaft comprises a second input shaft and a second output shaft, an input end and an output end of the first electromagnetic clutch are correspondingly and fixedly connected with the first input shaft and a first output shaft, an input end and an output end of the second electromagnetic clutch are correspondingly and fixedly connected with the second input shaft and the second output shaft, an input end of a single chip microcomputer in the control unit is connected with a rotation speed sensor and a speed feedback interface of the motor, and an output end of the single chip microcomputer is respectively connected with control ends of the first electromagnetic clutch and the second electromagnetic clutch. The power driving system is small in size, light in weight, compact in structure and excellent in operating performance.