The utility model discloses an automatic spraying device for an aluminum shell, relates to the technical field of automatic spraying devices for aluminum shells, and aims at solving the problems thatan existing automatic spraying device for the aluminum shell is uneven in spraying and low in automation degree. An air outlet pipe is arranged on one side of the release agent storage tank body; a heat dissipation mechanism is arranged on the other side of the release agent storage tank body; a liquid inlet pipe is arranged above the release agent storage tank body; a sealing ring is arranged between the release agent storage tank body and the liquid inlet pipe; a centrifugal pump is arranged on one side of the liquid inlet pipe; a liquid outlet pipe is arranged above the centrifugal pump; asolenoid valve is arranged on the liquid outlet pipe, an air compressor is arranged below the solenoid valve, an electric control cabinet is arranged on one side of the air compressor, an air inlet pipe is arranged between the solenoid valve and the air compressor, a spraying pipe is arranged on one side of the solenoid valve, and a two-way spray head is arranged on one side of the spraying pipe.