The utility model discloses a positive motor tricycle of rearmounted rear -guard of engine, including frame (1), rear wheel (2) and engine (3), rear wheel (2) set up at frame (1) rear portion, still include right independent suspension (4) and left independent suspension (5), engine (3) set up the rear portion in frame (1), engine (3) are connected with rear wheel (2) through the drive shaft, right side independent suspension (4), a left side independent suspension (5) set up on frame (1), right side independent suspension (4), a left side independent suspension (5) are respectively with right back round, left side rear connection. The beneficial effects are that: the independent suspension is adopted in the shock attenuation, and the shock attenuation is effectual, and the engine setting is at the rear of vehicle, need not the transmission shaft of overlength, and power transmission is efficient.