Well drilling foam generating device

The utility model discloses a drilling well foam generating device which comprises a foam storage tank, an air inlet and a feeding port are formed in the bottom of the foam storage tank, an exhaust port and a discharging port are formed in the top of the foam storage tank, the air inlet is connected with an air compressor through an air inlet valve, and the discharging port is connected with a drilling well through a discharging valve. A feed valve and an exhaust valve are arranged on the feed port and the exhaust port respectively, the air compressor is connected with the drilling well through a main air pipeline, and a main vent valve is arranged on the main air pipeline; according to the scheme, manual foam filling is replaced, switching injection of compressed air and foam can be achieved through switching of the valves, the operation time and safety risks in the foam filling process are reduced, gas stopping operation is avoided, rock debris in a well is prevented from falling back to the bottom of the w