The present invention discloses a production method of decolouring agent for edible oil. Said method is characterized by that it adopts the following steps: pulverizing Hangjin No.2 soil, adding hydrochloric acid and slightly boiling, filtering to obtain filter cake, collecting filtrate, washing filter cake with water to neutrality, natural drying cleaned filter care, roasting in high-temp. furnace, cooling and pulverizing to above 250 meshes so as to obtain the invented decolouring agent for edible oil.