An automotive three-clutch hybrid power transmission system is composed of an engine, a dual mass flywheel, a generator, an energy storage device, a motor, three clutches, two input shafts, two output shafts, six idler gears, seven fixed gears and five synchronizers. The automotive three-clutch hybrid power transmission system is characterized in that the engine is connected with the double clutch through the dual mass flywheel, the generator is connected with the double clutch and the energy storage device, and the motor is connected with the energy storage device and the third clutch; the first input shaft is connected with the first clutch and the third clutch, the second input shaft is connected with the second clutch, the second input shaft and the second output shaft are both hollow shafts and are arranged on the first input shaft and the first output shaft respectively in a nested mode, and the first input shaft and the first output shaft are arranged in a spatially parallel mode. The automotive three-clutch hybrid power transmission system has the advantages that gear shifting is convenient, power failure is avoided, the hybrid power transmission path is clear, the structure is compact, multiple work modes can be achieved, energy utilization efficiency is high, and good comprehensive performance is achieved.