The invention relates to a heat storage peak regulation system combining a solid heat storage electric boiler and a cross-seasonal natural water body. The heat storage peak regulation system comprises a power plant heating system, a cross-seasonal natural water body system, a solid heat storage electric boiler system and a heat-supply network water circulation system, wherein the cross-seasonal natural water body system comprises a water storage pit, a heat storage water body, a water distributor, a water bottom protection layer, a heat-insulating covering layer on a water body surface, and a rainwater collecting and drainage system; the solid heat storage electric boiler system comprises a solid heat storage electric boiler and a power grid and a pipeline connected with the solid heat storage electric boiler; the power plant heating system comprises a heat-supply network heater. Through adopting a thermal power heating unit operation flexibility technology and an electric boiler district heating technology, and in combination with a cross-seasonal natural water body in summer for heat storage, the deep participating in peak load regulation of a thermal power plant in summer can be realized, so that an on-grid peak load regulation capacity of a thermoelectric unit in summer is remarkably improved, the heat storage peak regulation system not only can be used for effectively relieving renewable energy source absorption predicament, but also can realize huge-scale cross-seasonal heat storage of heat supply hot water, and is wide in market developing prospect in the future.