Pressure-regulating device for natural gas high-pressure storage well

The utility model relates to a pressure-regulating device for natural gas high-pressure storage well, comprising a compressor, a gas storage, a gas vendor, a connection pipe-line and valves. A oil storage tank is connected on the gas storage by the valves, an oiling pipe-line and a hydraulic pump. A return pipe-line is provided between the oil storage tank and the gas storage. When a pressure of the gas storage is not enough, hydraulic oil is feed in the gas storage by the oiling pipe-line, thus volume of the gas storage is changed, natural gas pressure within the natural gas and exhaust pressure in an exhaust port are increased, and the gas feeding rate is improved to replenish lack of gas output of the compressor, satisfy pressure requirement of the gas vendor and maintain filling gas quantity of the filling gas vehicle.