The invention discloses a daily operation method adopting a thermal storage device of a renewable energy combined cooling heating and power (CCHP) cogeneration system. According to the daily operationmethod, various time periods of heat charge/heat release state strategies which are beneficial to improving the energy utilization efficiency can be obtained by acquiring the hour economy maximum heat charge/heat release amount; under the condition of further taking full advantage of the thermal storage capacity according to the hour economy maximum heat charge/heat release amount, each time period of heat charge/heat release amount of the thermal storage device is obtained at a time according to the daily thermal storage capacity of the thermal storage device. Through the strategies, renewable energy sources can be absorbed, and the energy utilization efficiency can be improved.