The invention discloses a using method of a mold release agent for a disc casting machine, and belongs to the field of copper anode plate casting. According to the using method, when the mold releaseagent is used, the mold release agent is coated on the inner surface of a copper mold cavity body, and a sintering layer is formed between copper liquid and the inner surface of the copper mold cavitybody after the copper liquid is poured to isolate the copper anode plate from the inner surface of the copper mold cavity body; and the mold release agent comprises aluminum-silicon series silicate minerals, sodium carboxymethyl cellulose, composite submicron powder and additives. According to the using method of the mold release agent for the disc casting machine, the sintering layer is formed between a copper mold and a copper anode plate so as to isolate the copper mold from the copper anode plate, thus, the service life of the copper mold is prolonged, and the appearance quality of the copper anode plate is improved.