The invention provides a natural gas temperature-adjusting and pressure-adjusting system with an ultra-low temperature environment heat taking function on the basis of incoming flow pressure energy recovery and belongs to the field of natural gas. According to the natural gas temperature-adjusting and pressure-adjusting system, pipeline natural gas, compressed natural gas and liquefied natural gasare included. According to the system, a pressure driving type heating unit composed of a vortex pipe, an air-temperature type heat exchanger and an ejector is adopted to replace an existing heater (as for the LNG, a low-temperature liquid pressurizing pump is arranged between a storing tank and an air-temperature type gasifier so as to increase the NG pressure at an outlet of the air-temperaturetype gasifier). Through the two pressure driving devices, namely the ejector and the vortex pipe, the low-temperature NG of an outlet of the cold end of the vortex pipe is led into the air-temperature type heat exchanger to absorb heat from the environment continuously; and meanwhile the gas coming out of the hot end of the vortex pipe is heated to directly meet the temperature requirement of a pipe net, and the purpose that heater energy consumption is not needed is achieved accordingly.