The invention discloses a heat and power cogeneration system combining a vacuum tube and a flat plate solar collector. The heat and power cogeneration system comprises a vacuum tube solar collector, ahigh temperature stage hot fluid tank, an evaporator, a low temperature stage hot fluid tank, a heat exchanger, a cold fluid tank, a first circulating pump, the flat plate solar collector, a second circulating pump, a turbine, a condenser and a working medium pump which form a vacuum tube solar collector pipeline, a flat plate solar collector pipeline, an organic rankine cycle pipeline and a domestic hot water pipeline. According to the system, the flat plate solar collector and a vacuum tube solar collector are combined, and working media are evaporated and gasified by using high temperatureheat conducting oil heated by the vacuum tube solar collector as a heat source, so that a steam turbine is driven for power generation; domestic hot water is heated through low temperature heat conducting oil heated by the flat plate solar collector and the heat conducting oil flowing out from a hot fluid outlet of the organic rankine cycle evaporator, so that the energy utilization rate and thesystem economy are improved; and the gradient utilization of heat energy is achieved.