The invention relates to a GCr15 bearing steel heat treatment method. Before processing GCr15 bearing steel blank material parts, a spheroidizing annealing step is carried out; the manufactured parts are subjected to a quenching step and a first low-temperature tempering step; after the quenching step and the first low-temperature tempering step, the parts are subjected to a cold treatment step; and the obtained parts are subjected to a secondary low-temperature tempering step. With the GCr15 bearing steel heat treatment method, bearing part dimensional stability can be improved, and bearing part service life can be prolonged.