The invention belongs to the technical field of dispatching automation of an electric power system, and relates to a day-ahead generation schedule optimization method considering thermal power and electric thermal storage combined peaking. Based on day-ahead generation schedule planning input data, on the basis of a conventional optimization model, relevant parameters of thermal power generating unit deep peaking and electric thermal storage energy storage peaking are maintained, relevant constraint conditions of thermal power generating unit deep peaking and electric thermal storage energy storage peaking are introduced, and a day-ahead generation schedule optimization model, namely an SCED model, considering thermal power and electric thermal storage combined peaking is formed; through the optimization model, the future operation condition of a power grid can be combined, a more reliable and effective thermal power and electric thermal storage energy storage active plan is programmedunder the condition that system new energy consumption capacity and system load peaking requirement are sufficiently evaluated, the unit planning implementation rate is improved, the system peaking pressure is alleviated, the maximum consumption of new energy is realized, and the increasingly refined large power grid safety operation requirement is met.