The invention provides a heat treatment technology of a low chromium grinding ball and relates to the field of wear-resistant materials. The heat treatment technology of the low chromium grinding ballcomprises the following steps of conducting ultrasonic cleaning on the surface of the grinding ball with acetone, polishing with abrasive paper, conducting ultrasonic washing, drying for stand -by and cutting alloy into a required size; putting the grinding ball and the alloy into a double glow plasma surface metallurgy diffusion metallizing furnace, vacuumizing the double glow plasma surface metallurgy diffusion metallizing furnace to air pressure of 0.5-1.5Pa, injecting mixed gas into a furnace cavity, starting glows and working for 3-5h; taking out the grinding ball, heating the grinding ball to 200-300 DEG C and keeping the temperature for 10-15 min; then heating the grinding ball to 800-980 DEG C, keeping the temperature for 2-3h, and putting the grinding ball into a water base quenching agent at a concentration of 15-25% for quenching; and making the grinding ball stand for 10-20min after taking out the grinding ball from the water base quenching agent, heating the grinding ballto 400-500 DEG C, keeping the temperature for 1.5-3h, then cooling by means of air, taking out the grinding ball from the furnace, and obtaining the finished product of the grinding ball. The technology has the advantages of being simple in process and low in cost; and the produced grinding ball is high in strength and hardness, and good in toughness, heat resisting property and corrosion resisting property.