The invention relates to a power generation system employing biomass heat energy matched with solar heat energy. The power generation system comprises a biomass gasification unit, a solar application unit and a power generation unit, wherein the biomass gasification unit comprises a biomass gasifier; a biomass gas generated by the biomass gasifier enters a gas-fired boiler to heat and vaporize water in the gas-fired boiler and to generate water vapor; the water vapor firstly enters a steam box and then enters the power generation unit for generating electricity through the power generation unit; the solar application unit is connected with the gas-fired boiler; water in the water tank firstly enters the solar application unit to be preheated and then preheated water flows into the gas-fired boiler; and the biomass gas generated by the biomass gasifier is heated again and generates water vapor.