Large energy storage water tank of heat supply system

The utility model discloses a large energy storage water tank of a heat supply system. The large energy storage water tank comprises an outer tank, energy storage columns, a positioning base, a top fence, a protective net, a water inlet frame and a sealing cover. According to the large energy storage water tank of the heat supply system, energy storage water enters the inlet pipe from the inlet hole in sequence and enters the main pipe inner frame through the inlet pipe, the electric heating element in the positioning base heats the energy storage water in the main pipe inner frame, the energy storage water is pressurized in the pressure reduction inner pipe, and the pressure reduction inner pipe is pressurized. The pressure reduction inner pipes are extruded by the energy storage water to form longitudinal expansion, the main pipe inner frames can be prevented from being extruded and broken by the energy storage water, meanwhile, the energy storage water circulates mutually under communication of the connect