The utility model discloses a pressure spray extinguishing gun. The extinguishing gun comprises a gas-water supply device and a spraying ejector, wherein the gas-water supply device comprises a high-pressure gas storage bottle and a water tank which are communicated with each other; the spraying ejector comprises a tubular spray chamber, a nozzle and an ejection control device; a spray gas inlet and a spray water inlet which are respectively communicated with the high-pressure gas storage bottle and the water tank are formed on the spray chamber; the nozzle is arranged at the front end of the spray chamber; the ejection control device comprises a normally closed gas valve, a normally closed water valve and a valve control switch; the normally closed gas valve and the normally closed water valve are respectively arranged on the spray gas inlet and the spray water inlet; and the valve control switch controls the normally closed gas valve and the normally closed water valve to be opened synchronously. When in use, as the normally closed gas valve and the normally closed water valve are opened synchronously, high pressure gas and water continuously enter the spray chamber; and water is pounded to form minimal liquid drops under the action of high speed gas flow, so as to produce continuously ejected water mist, and therefore the extinguishing effect is greatly improved and the extinguishing grade is increased to 4A or 5B.