Gas pressure regulator with pressure relief function

The invention belongs to the technical field of gas pressure regulators, aims to solve the problems that a gas leakage protection mechanism is difficult to arrange in a valve body, gas leakage in the valve body is reduced, and the safety of a pressure reducing valve in use is further improved, and particularly relates to a gas pressure regulator with a pressure relief function. A gas inlet cavity, a movable cavity and a gas outlet cavity are sequentially formed in the valve body from left to right, a fuel gas conveying opening is formed between the gas inlet cavity and the gas outlet cavity, a movable rod is arranged in the fuel gas conveying opening, and the bottom end of the movable rod is located in the gas outlet cavity and fixedly connected with a blocking plate. And along with continuous increase of the air pressure in the valve body, the fuel gas extrudes a second piston plate outwards, so that the fuel gas enters a gas collection hopper through two second gas leakage pipes, pressure relief protection