The invention discloses a method for producing a wax medium of a thermostat. According to the method, an F-T synthetic product is taken as a raw material and is firstly subjected to hydro-conversion; a hydrogenation product is distilled and prepared into a suitable distilling component; the suitable distilling component is sweated for producing a target product. According to the method provided by the invention, on the basis of a common sweating technology, air flow is utilized to carry a liquid component by a wax layer so as to forcefully separate a solid component from the liquid component in a sweating process, and meanwhile, optimally, aqueous solutions of more than two matters capable of reacting and generating gas are respectively emulsified and then sweated and the quick emission of the liquid component is benefited. The method disclosed by the invention has the advantages of low equipment investment, simple preparation process, low operation cost, safety, no solvent pollution, and the like. The acquired product is narrow in temperature control scope and can be used as the wax medium of a waxy temperature control valve, especially the thermostat.