The utility model relates to a wire harness through hole protection sleeve having a funnel-shaped integrated structure, a close-up part has a circular tube-shaped structure and is uniform in wall thickness, an opening part has a conical tube-shaped structure which gradually increases in wall thickness from the upper opening to the lower opening, and the inner part of the opening part is provided with a support structure of which the cross section is shaped like a circular ring. The outer surface of an end part, close to the large opening, of the opening part is provided with a ring of a groove. An end part of the lower panel, matched with a sheet metal hole, of the groove is provided with a ring of an upward protrusion. The wire harness through hole protection sleeve of the technical solution is characterized in that a wire harness can be protected and fixed and can be prevented from being worn by a sheet metal blade edge, electrical security can be improved, the middle of the wire harness through hole protection sleeve is provided with support structure, the wire harness can be prevented from shaking, a protruding structure of the protection sleeve can prevent the edge of the protection sleeve from water leakage.