The invention provides a wind power-photovoltaic-heat storage combined power generation system. The system is composed of a wind power subsystem, a photovoltaic subsystem, an electric heater, a heat storage system and a matched steam turbine set. The electric heater is mainly used for converting redundant waste wind power energy and waste photoelectric energy into heat energy when the output of the system is larger than load requirements and storing the heat energy in the heat storage system, and when the output of the system is smaller than the load requirements, the heat storage system releases the heat energy to push the steam turbine set to generate power. According to the combined power generation system, the wind power and photovoltaic output can be effectively adjusted, and the channel utilization rate and the energy use rate are increased.