The maximum allowable input pressure of the gas from the wellhead is 32MPa. After the heating furnace of the water jacket, after the heating, the pressure is reduced by the throttle and the lower pressure <25MPa, and then enters the water jacket separator, and the initial gas liquid is separated. After the separation, the natural gas goes into the pre-dehydration device for deep dehydration, and the natural gas is filled with the tank car through the filling port of the compressor. When the wellhead pressure is lower than 20 mpa, this set of high-pressure direct filling device the system pressure is flat, from tank lorry tank lorry pressure after filling, the compressor pressure, pressure filling tank lorry to pressure tank lorry requirements.