The invention discloses an infrared reversible desiccant assembly and application thereof. The infrared reversible desiccant assembly includes a shell and reversible desiccant bodies, wherein the shell is an adsorption vessel with the one or more reversible desiccant bodies, an air vent for circulation of internal gas is formed in one side of the shell, and the air vent is provided with a breathable material; and the reversible desiccant bodies include desiccants added with infrared radiation materials and a plurality of opened sponge supporting parts, and the area formed by division of the opened sponge supporting parts is filled with the desiccants. In this way, according to the infrared reversible desiccant assembly and application thereof, micro moisture in car lamps or in other tiny spaces can be quickly absorbed, the moisture rate reaches 120-190%, a to-be-dried space keeps in a relative dry state for a long time, the occurrence of fog can be effectively reduced, or the speed offog dispersal can be effectively increased; and when the humidity of the to-be-dried space is small, the assembly liberates moisture outwards, and the moisture can be exchanged with air flows inside and outside the lamps to be discharged out of lamp bodies.