The invention relates to the technical field of the electronic control device, particularly to a relay comprising a base plate, an outer housing, a main relay body structure fixed at the base plate, and an inner housing for sealing the main relay body structure. The inner housing is fixedly installed at the base plate. A support plate encircling the inner housing is arranged at the side wall of the lower part of the inner housing; and an annular corrugated conduit is arranged at the support plate. A one-way inlet value is arranged at one side, far away from the inner housing, of the corrugated conduit; and a one-way exhaust valve is arranged at one side, approaching the inner housing, of the corrugated conduit. The outer housing is fixed on the upper surface of the corrugated conduit and covers the inner housing; and a plurality of through holes are formed in the outer housing. The relay is applied to a vehicle specially and has dustproof and waterproof performances; and the relay can be cooled effectively to avoid circuit burning of the relay.