Assistor of motor tricycle

The utility model discloses an assistor of a motor tricycle. The assistor comprises a box (1), an input shaft (2), an output shaft (3) and a middle shaft (4) are arranged in the box (1), transmission teeth (5) are arranged at one end of the middle shaft (4), a drive gear shaft (6) with one end stretching out of the box (1) is arranged in the box (1), and a gear on the drive gear shaft (6) is meshed with the transmission teeth (5). The assistor has the advantages of being simple in structure, reliable to use and low in manufacturing low, power can be added to the motor tricycle, the power can be transmitted to an external device, and the use range of the assistor is widened.