The invention discloses a heat supply unit thermoelectric ratio calculation method considering an energy quality coefficient, and relates to the technical field of thermal power plant heat supply unitoperation. The method comprises the following steps: calculating the external heat supply amount of a heat supply unit, the heat supply energy quality coefficient of a steam turbine, the heat energyquality coefficient of a heat user, the heat consumption of the heat user and the energy quality coefficient ratio of steam turbine heat supply by adopting a heat method and an actual enthalpy drop method, and finally obtaining the heat supply unit thermoelectric ratio considering the energy quality coefficient. According to the method, firstly, the heat supply unit thermoelectric ratio calculation method considering the energy quality coefficient is provided, the utilization effect of a thermodynamic system is better reflected, and the method has important significance in improving the operation heat economy of the heat supply unit and saving energy and reducing emission in the thermal power industry.