The utility model discloses a high and cold type membrane separation system nitrogen device, including the base, install the sealed dustcoat on the base, lie in interconnect was installed to the dustcoat system nitrogen sled and pressure boost sled on the base, the pressure boost sled includes installs engine and the automatically controlled cabinet on the base, installs on the cylinder liner water route of engine to be used for carrying out the low temperature heating ware that heats to the engine fluid, install heating jacket and temperature sensor on the oil circuit of engine, heating jacket and temperature sensor are connected with automatically controlled cabinet electricity, still be equipped with on the engine and be used for carrying out the automatically controlled cabinet control panel heating device that heats to automatically controlled cabinet control panel, the inside companion torrid zone that is equipped with of interlayer of dustcoat. The utility model discloses it is rational in infrastructure, can guarantee engine, automatically controlled cabinet control panel and normally work, it is sealed effectual, can use at severe cold district.