The invention discloses an oil-water automatic control separation device which comprises a cylinder and a device base, wherein an oil-water separation chamber and an oil storage tank are arranged inside the cylinder, and an oil-medicine secondary mixing tank is arranged inside the cylinder; a right protruding circular plate inverted triangular weir is arranged between the oil-medicine secondary mixing tank and the oil-water separation chamber; a left protruding circular plate inverted triangular weir is arranged between the oil storage tank and the oil-water separation chamber; a top cover of the cylinder is a horizontal circular sealing head; the middle of the circular sealing head is an inspection hole; the left side of the inspection hole is an exhaust pipe; and right side of the inspection hole is a medication adding room; semi-closed separation plates are evenly arranged in the oil-medicine secondary mixing tank; gas distribution pipes are evenly paved at the bottom of the oil-water separation chamber; a waste water discharge pipe and a manual control water discharge pipe are arranged at the bottom of the oil-water separation chamber simultaneously; a gas supply pipe of a heater is located in the device base, gas supply is provided by a gas collection tank; and then the gas is provided for a middle heating disc and a high-position heating disc through a heating disc gas supply branch pipe. The oil-water automatic control separation device is simple in structure, complex in distribution, high in space using ratio and simple to operate, and is capable of saving energy and reducing emission.