Expansion liquid storage tank capable of automatically adjusting pressure

The utility model discloses an expansion liquid storage tank capable of automatically adjusting pressure, which belongs to the technical field of heat conduction oil heating systems and comprises a self-adjusting valve group and an expansion liquid storage tank body provided with an exhaust port, and the self-adjusting valve group comprises a pressure relief stop valve in a normally open state and a self-operated adjusting valve connected with the pressure relief stop valve. And the pressure relief stop valve is communicated with the exhaust port. When the pressure in the expansion liquid storage tank exceeds a set value, the self-operated regulating valve can be automatically switched to an open state to discharge nitrogen in the expansion liquid storage tank to recover the internal pressure, so that the purpose of pressure self-regulation is achieved, and meanwhile, the self-operated regulating valve is not driven by electric power because the self-operated regulating valve determines whether to open or clo