Gas filling and discharging (also known as filling platform) is used as a filling device for filling gas cylinders. It is installed on the explosion-proof wall of the filling room with a fixed bracket and consists of two collection tubes on the left and right sides. There are two high-pressure valves connected in the middle, dividing the entire oxygen filling platform into two groups. Each group consists of a considerable number of oxygen filling valves and a vent valve, which can fill a considerable number of gas cylinders each time so that the two groups can work in rotation. There is a pressure gauge and a safety valve installed in the middle to ensure the safety and feasibility.