The invention provides a chromium ore composite pellet used for reduction in an argon-oxygen refining furnace, a production method and an application thereof. The chromium ore composite pellet includes the following components, by weight, 40-52% of chromium ore, 10-25% of metal manganese, 10-25% of silicon iron, 5-12% of metal calcium and 4-6% of a binder. Strong reduction agents, the metal manganese and the metal calcium, are added to the chromium ore composite pellet, so that dissolution of chromium ore is accelerated, desulfurization of slag is improved and yields of chromium and manganese in the chromium ore composite pellet are increased. The chromium ore composite pellet is added when oxygen blowing for decarbonization is finished in the argon-oxygen refining furnace, wherein the addition amount of the chromium ore pellets is accurately calculated through surplus heat of molten steel in the argon-oxygen refining furnace, so that peroxidation of the molten steel of stainless steel is effectively prevented. The yields of the chromium and manganese in the chromium ore composite pellet reach more than 90%. Consumption of reduced silicon iron is not influenced.