The invention provides a thermoelectric decoupling system with a heat storage function. The system comprises a fused salt heat storage system arranged on a reheat steam pipeline of a turbine unit, wherein a heat supply network water outlet of the fused salt heat storage system is connected with a heat supply network system through a heat exchange system. Since a reheat steam pipeline of the turbine unit is provided with a branch to be connected with a fused salt heat storage system, and heat produced when a turbine is operated at the high power generation load is stored through fused salt. When the turbine needs to be subjected to low-load peak regulation and the power generation power of the turbine is reduced, fused salt can release heat to supplement heat to the heat supply network so as to achieve thermoelectric decoupling. The problem that an existing thermal power generating unit with a heat supply function cannot meet the adjusting requirements of the generating capacity and theheat supply capacity at the same time is solved, and therefore the system has the important significance in improving flexibility of a heat supply unit, saving energy and reducing emission.