The utility model relates to the technical field of wire harness switching, in particular to a wire harness waterproof switching structure. Comprising a bottom shell and an auxiliary device, the bottom shell is provided with a water retaining part, the auxiliary device comprises an insulating table, a
binding post, a guide piece, a fastening nut, a top cover and a waterproof
assembly, when the wire harnesses are switched over, the wire harnesses on the two sides penetrate into the interior from wire passing openings in the two sides of the bottom shell respectively, then the fastening nut is screwed off, a connecting piece of the wire harnesses is arranged on the
binding post and located above the guide piece, and finally the waterproof
assembly is connected with the top cover. After the top cover is installed, the top cover is matched with the waterproof
assembly to achieve
water resistance, when the wire harness needs to be replaced, the top cover is detached, the fastening nut is screwed off, the wire harness connecting piece can be taken out, and after the wire harness is pulled out, a new wire harness can be inserted again for switching, so that when the wire harness is switched, the wire harness can be replaced conveniently, and the switching efficiency is improved. And good reutilization can be realized.