The invention relates to a recycling method for natural gas pipe network pressure energy in the gas turbine working field and a device thereof, aiming at solving the problem of the loss of energy in the depressurization of high-pressure natural gas. The technical proposal is that the cold air flow and the hot air flow generated after the high-pressure natural gas is depressurized through a vortextube are respectively outputted, the cold air flow after absorbing the inverse air in a heat exchanger and the heat of the exhaust gas of the gas turbine and being heated up joins with the hot air flow and enters a combustion chamber of the gas turbine set; the air cooled by the heat exchanger enters a compressor of the gas turbine set for boosting pressure and then is introduced to the combustion chamber of the gas turbine set; in the combustion chamber, the natural gas is combusted with the air to lead the gas turbine to work and drive energy-consumed equipment. The method of the invention selects the vortex tube to complete the depressurization and pressure adjustment of the natural gas and utilizes the low temperature natural gas flow to cool the intake air of the compressor to increase the mass flow of the intake air, thereby greatly increasing the output of the gas turbine and the economy and effectively utilizing the pressure energy.