A wiring improvement method and a wiring apparatus for an outgoing line of an alternating current frequency conversion traction motor for track traffic vehicles are disclosed, mainly for solving the technical problems that a three-phase cable sheath is likely to be aged, damaged or cracked, and the problems of inconvenient overhaul and the like when a wiring apparatus leads a three-phase power supply cable into a motor in the motor running process. A U terminal, a V terminal and a W terminal of the motor are improved into an L-shaped lead wire connector (5); the lead wire connector (5) is formed by circular copper rods and copper bars in a mutual fixed connection manner; a connector of an external cable is improved to be a flat-stripe-structured cable connector (6) having a mounting hole; and the lead wire connector (5) and the cable connector (6) are fixedly connected in a sealing box body. The wiring apparatus is simple in structure, reliable, convenient to operate and maintain, and can be widely applied to the alternating current frequency conversion traction motors of subways, light rails and the like, as well as can be widely applied to the improvements of the alternating current frequency conversion traction motors for various track traffic vehicles.