The invention discloses an electricity-to-gas storage tank combined gas-electricity comprehensive energy system optimization scheduling method. According to the method, firstly, models of a natural gas system, a power system and coupling elements are established; secondly, a scheduling framework of the gas-electricity comprehensive energy system is established according to an energy bidirectionalinteraction mechanism of a natural gas system and an electric power system, a gas turbine serves as a peak shaving unit of the electric power system, P2G consumes excessive wind power and stores the wind power in a gas storage tank, and gas is supplied to a gas network in a contract gas supply mode; and then a scheduling model of a 24-time period of one day is established by taking the optimal economy as a target. According to the electricity-to-gas-storage-tank-combined gas-electricity comprehensive energy system optimal scheduling method, a theoretical basis and a new scheduling method are provided for planning design and optimal scheduling operation of the comprehensive energy system.