The gas adding sub station with the gas adding method in high pressure and the device is made by the gas supplying system of three lines sequence in gas adding station, the high pressure gas supping system connected with the multi lines gas in auto sequencing gas adder. In keeping the normal gas adding pressure, the additional high pressure gas supplying system is opened; the gas adder adds the gas to out according to the low, middle, high pressure and additional high pressure sequence, so the gas supplying time of the low pressure gas bottle is prolonged. The invention has the high gas getting effect and gas transforming effect; it also can save the energy, has low cost, stable gas adding pressure to increase the set distance between the gas adding sub station and mother station, to enlarge the radiating field to benefit for using the gas automotive.