The invention relates to the technical field of natural gas supply systems, and discloses a gas supply system which comprises a natural gas storage device, a gas inlet pipeline and a gas outlet pipeline. An end of the gas inlet pipeline is connected with the natural gas storage device; a first control valve and a pressure regulating device are sequentially arranged on the gas inlet pipeline; an end of the gas outlet pipeline is connected with the natural gas storage device; a second control valve and a pressure regulating valve are sequentially arranged on the gas outlet pipeline. The gas supply system has the advantages that gas can be assuredly continuously supplied for user sides by the gas supply system in certain time under the condition that gas cannot be normally supplied by naturalgas sources, and accordingly the natural gas supply stability can be improved.