Heating device of solar subsystem

The utility model discloses a heating device of a solar subsystem. The heating device comprises a water supplementing tank, a heating water tank, an auxiliary heat source, a solar heat collector, a heat exchanger and a heating device, the first inlet end of the heating water tank is communicated with a pipeline between the outlet end of the solar heat collector and the heating medium inlet end ofthe heat exchanger, and the first outlet end of the heating water tank and the outlet end of the water supplementing tank are both communicated with a pipeline between the inlet end of the solar heatcollector and the heating medium outlet end of the heat exchanger; the second outlet end of the heating water tank is communicated with a user side, and the second inlet end of the heating water tankis communicated with a tap water pipe through a water valve; the inlet end of the auxiliary heat source is communicated with a pipeline between the refrigerant outlet end of the heat exchanger and theinlet end of the heating de