The present invention discloses a technology for processing oil quenching of a high chromium casting ball, firstly a high chromium casting ball fetched from a furnace justly is feed into a quenching furnace for 10 to 24 minutes at a temperature of 960 DEG C after preheating, then the high chromium casting ball is feed into a oil sump of 100 DEG C to 110 DEG C for quenching for 10 to 12 minutes, the high chromium casting ball is fetched after oil quenching to be carried with a tempering treatment for 8 hours at a temperature from 420 DEG C to 450 DEG C. The diameter of the high chromium casting ball is from 80 to 100 mm. the quenching oil of the oil sump is that the proportionalities of each component of the high chromium casting ball are the oil quenching processing technology of the invention, the heat-treatment technology replaces the wind quenching by the oil quenching, the quenching time and quenching temperature are adjusted, the oil sump temperature is controlled, the tempering time and the tempering temperature are all adjusted, thus the impelling strength and hardness of the Phi80 high chromium casting ball are all improved, the inner and the external hardness are in equilibria, the product impact fatigue number is increased by two times which is above to 30, 000, and the manganese content of the product is reduced in a range from 0.4 to 0.7.