The utility model provides a hybrid system of automobile belongs to car technical field. It has solved the requirement that the automobile hybrid power system is difficult to to realize the common optimal design of fuel consumption and automobile body size. This hybrid system of automobile includes driving motor, power output shaft, the jackshaft with can drive power output shaft pivoted engine, power output shaft and jackshaft parallel arrangement, power output shaft links to each other with the jackshaft and drives the jackshaft through first gear pair and rotates, be equipped with the jackshaft drive pinion associative with automotive differential on the jackshaft, be equipped with the driving motor driving gear on driving motor's the output shaft, be equipped with on the jackshaft withdriving motor driving gear engaged with driving motor driven gear, the gear ratio of driving motor driven gear and driving motor driving gear is greater than the gear ratio of first gear pair. The utility model discloses guaranteeing under fuel economy's the prerequisite, can reduce the size of automobile body.