Provided is a hybrid power system capable of achieving no power cut-off switching. The system includes an engine and wheels, and further includes an epicyclic gear train, a first motor, a second motor, a first clutch, a second clutch, a third clutch and a fourth clutch; the epicyclic gear train includes a planet gear, a sun gear, a gear ring and a tie rod, the planet gear is respectively connectedwith the sun gear and the gear ring, and the output end of the planet gear is connected with the wheels through the tie rod; the fourth clutch is disposed between the engine and the first motor, thesecond clutch is disposed between the first motor and the gear ring, and the third clutch is disposed between the first motor and the second motor; and the second motor is connected with the sun gear,and the first clutch is disposed on one side of the gear ring. The system has the advantages of being simple in structure and low in energy consumption, adopts a four-clutch single-rotation gear train structure and can provide large torque under low-medium-speed state so as to achieve no power cut-off switching.