The invention discloses a device for cleaning a pouring cup of an investment casting mould shell. The device comprises a trolley, a water tank and abrasive discs, wherein the water tank is fixedly arranged on the trolley; clear water is contained in the water tank; two baffle plates which are arranged in a crossed mode are arranged on the bottom of the water tank; the two abrasive discs are separately blocked on two opposite corners in the water tank, and are pasted on the bottom of the water tank through a waterproof binder; and a water drainage control valve is mounted on the bottom of the water tank. The device for cleaning the pouring cup of the investment casting mould shell is simple in structure, is low in cost, is convenient to operate, can effectively clear the pouring cup of the mould shell to be clean and orderly, and avoids the casting defect due to the fact that impurities of the pouring cup of the mould shell drop into a mould cavity of a cast piece.