The invention discloses a power line laying detachable type wiring device, the cross section of which is in the shape of a quadrangle. The wiring device is constituted by a bottom plate, side plates, a supporting rack, a cover plate, and a baffle plate. The bottom plate is provided with transmitting holes, and the lower surface is provided with at least two supporting blocks, and the upper surface of the cover plate is uniformly provided with diversion grooves, and in addition, the baffle plate is additionally provided with wire penetrating holes. The outer surfaces of the side plates are respectively provided with at least one conveying grooves, and at least one supporting rack is disposed on the inner surfaces of the side plates, and each supporting rack is constituted by at least two supporting plates, each of which is constituted by a carrying plate and a connecting plate, and the carrying plate and the connecting plate are connected together by a reinforced rib plate. Compared to the conventional wire trench used for the wire arranging, the structure is simple, and the use is flexible and convenient, and the site adaptability is strong; the constriction costs are low, the construction strength is low, and the construction efficiency is high; the wire working environment can be greatly improved, and the daily inspection or the replacement of the power wire can be facilitated; and the wiring device is widely used for various power wire arranging occasions.