Building fire water supply often uses air pressure tanks instead of high-level water tanks to meet the initial water consumption for 10 minutes of fire protection, but ordinary air pressure tanks are often used to occupy a large space. Fire-fighting gas top pressure water supply equipment is a new type of fixed fire extinguishing device produced according to GB/T50016 “Code for Fire Protection Design of Buildings” and GB27898.4 “Fixed Fire Fire Water Supply Equipment Part 4: Fire-fighting Gas Top Pressure Water Supply Equipment”. The device is composed of an air pressure water tank, a pressure stabilizing device, a decompression device, an air stop device, a sensor, an electric control system, etc. The volume of the tank is 3 to 5 times that of an ordinary air pressure tank, and the water supply pressure is stable. It is an ideal large-scale water tank. Emergency fire water supply equipment, the equipment has automatic operation log recording and export functions, which is convenient for determining the responsibility and analysis of the cause of the accident.