Suncenter DLS-D25C-2 model gas filling machine adots compressed air as power source, and the built-in pneumatic booster pump automatically reciprocates and pressurizes in proportion to drive the medium gas to be transported and filled in a high-pressure liquid state, which greatly improves the filling speed. Moreover, the machine adopts automatic pressure control and weight control to realize filling automation and improve filling efficiency and filling weight accuracy. It is especially suitable for filling liquid CO2, N2O, Freon and other media.