The invention relates to a heat treatment process for a 65Mn spring washer. The heat treatment process comprises the following steps: blanking; electric spark perforation of basic bores; linear cutting and forming; correction by a fitter; heat treatment; performance test; and surface treatment; wherein during quenching in the step of heat treatment, firstly, the 65Mn spring washer is subjected to preheating which means the 65Mn spring washer is put into a quenching tool heated in advance, then a quenching furnace is heated, charcoal is added into the quenching furnace, the quenching tool is placed into the quenching furnace with a temperature maintained to be constant, then the quenching tool is taken out, the 65Mn spring washer is put into the quenching tool, quenching is carried out immediately after thermal insulation, and the surface of the 65Mn spring washer is coated with an anti-oxidation decarburization paint before the 65Mn spring washer is placed into the quenching tool. According to the invention, the charcoal is added into the quenching furnace for generation of protective gas, the anti-oxidation decarburization paint is coated on the surface of the spring washer for prevention of oxidation and decarburization, so desired performances of the spring washer are guaranteed.