The invention discloses an engine start/stop impact reduction-based engine power distribution system device, which comprises a housing. In the housing is supported an input shaft which extends out of the housing and is connected with a first transmission gear pair, the output gear of the transmission gear pair is connected with an intermediate shaft connected with the input end of a clutch, the output end of the clutch is connected to a first output shaft, the intermediate shaft is also connected with a second transmission gear pair having the output gear connected with a second output shaft, the shaft end of the input shaft is connected with a universal transmission shaft and flexible shaft coupling structure, and the shaft end of the first output shaft is connected with a flexible shaft coupling structure. The inventive device has compact structure, strong vibration resistance and multi-channel power output.