Fire gas top pressure includes electric control system, top pressure device, pressure stabilizer, air pressure water tank, air valve, container device, top pressure device is high pressure air compressor, gas cylinder group, top pressure valve connected in sequence; stable The pressure device is connected to the top pressure valve, and the top pressure valve is connected to the air pressure water tank; the air pressure water tank is provided with a magnetic plate liquid level meter, and the magnetic plate liquid level meter is provided with three liquid level contacts; The valve is connected, and a container is connected to the pipeline connecting the air pressure water tank and the check valve. The check valve is connected to the top pressure valve through a low-pressure gas path. The other end of the check valve is connected to a check valve. The check valve is connected to fire protection. Pipe Network. The beneficial effect of the utility model is that it can replace an indoor fire fighting water tank, and has the advantages of low investment, short construction period, simple construction and installation, and easy implementation of automatic control. The utility model is particularly suitable for buildings in seismic areas, hidden engineering, temporary buildings, and architectural artistic requirements. It is not suitable to set up a high-level water tank.