The invention discloses a wiring device of a power maintenance device. The wiring device comprises a wiring board and wiring grooves, wherein the wiring grooves are arranged in the wiring board, a wiring board end cover is arranged above the wiring board, at least two wiring grooves are arranged at intervals along a height direction of the wiring board and are semi-through grooves, the lengths of the wiring grooves are gradually reduced along the height direction of the wiring board from bottom to top, a connection end is arranged at one end of the wiring board and is communicated with the wiring grooves, a metal post is arranged at one end, far away from the connection end, of each wiring groove, an outgoing cable is arranged in each wiring groove and winds around the metal post, through holes are formed in the wiring board end cover, the number and the positions of the through holes are in correspondence to the number and the positions of the metal posts, and a fixed plate is arranged on the wiring board end cover. A hydraulic cylinder pushes metal connection parts to be in contact with the metal posts, and thus, an incoming cable and the outgoing cable are connected; and the wiring device is simple in structure and is safer and more reliable, and no manual operation is needed.