This paper studies the introduction of molten salt heat storage regulation in response to the problems of insufficient peak shaving capacity and heating capacity of thermal power units. A steam turbine-molten salt heat storage model was built, and the model error was within ±5%. Technically, after the peak shaving of thermal power units was assisted by molten salt, the peak shaving capacity of the units was enhanced, and the peak shaving depth was reduced to 28.49%. The heating capacity of the unit has been increased to 310 MW. In terms of economy, the net income increased by 361 million yuan in 20 years, and the cost of the device needs to be recovered in 5.66 years. The research results have reference significance for the transformation of the same type of thermal power units and the addition of molten salt energy storage to assist in peak shaving and heating.