A method and system for creating a start-stop plan for a cogeneration unit are provided. The method includes the steps of when discarded wind exists, calculating the maximum heat supply amount of thecogeneration unit based on a power supply condition of the cogeneration unit; based on the maximum heat supply amount, determining the available heat supply amount of the cogeneration unit; and determining the start-stop plan of the cogeneration unit based on the available heat supply amount and an obtained thermal load predicted curve. The method is a new unit combination mode for improving a wind power consumption capacity, satisfies an actual cogeneration dispatching demand, further enhances the space for wind power consumption under the premise of ensuring a heat supply demand, makes fulluse of heat load prediction, and further improves the utilization rate of wind power.