The invention discloses a driving device of a motorcycle rear wheel flat fork lock. The driving device comprises a motorcycle rear wheel flat fork body, a driving motor, an arched guide sleeve, a left guide pulley, a right guide pulley and a locking rod, wherein the motorcycle rear wheel flat fork body has an arched upper groove connected with a motorcycle body, and an arched lower groove used for mounting a motorcycle rear wheel and corresponding to the arched upper groove; a transmission rack is arranged at the edge of the locking rod, and is engaged with a gear mounted on an output shaft of the driving motor; the locking rod is arranged along the edge of the arched lower groove, and can be driven by the driving motor to slide along the arched lower groove; the driving motor and a motorcycle battery are serially connected by a lead; the guide sleeve is fixed on the inner wall of the motorcycle rear wheel flat fork body, and coats the locking rod; and when the locking rod moves along the guide sleeve by the maximum displacement, one end of the locking rod penetrates through one end of the guide sleeve and extends into the other end of the guide sleeve, and the motorcycle rear wheel flat fork lock realizes a locking function.