The invention discloses a double-layer thermal retraction bushing which comprises an outer layer and an inner layer which are integrated; the outer layer is a crystal type modified polyolefine material layer; the inner layer is a flame retardant hot melt adhesive layer. The double-layer thermal retraction bushing used as the bushing of a vehicle wire can effectively prevent copper corrosion and thermal oxidization aging, can carry out effective seal and isolation on the wire beam joint and terminal of the vehicle so as to effectively prevent the wire terminal and the joint of the vehicle under a wet environment from corrosion, and can carry out wear-resistance, oil-resistance and flame retardant protections on the wire terminals.