A hybrid power system, comprising an internal combustion engine and a solid oxide fuel cell SOFC stack, wherein: a first input end of the internal combustion engine is connected to a first output end of a first tee valve; an input end of the first tee valve is connected to a fuel gas feeder; a second output end of the first tee valve is connected to a first input end of a reformer; an output end of the reformer is connected to a first input end of the SOFC stack; a first output end of the SOFC stack is connected to a second input end of the internal combustion engine; an output end of the internal combustion engine is connected to an exhaust line, which is arranged adjacent to an outer wall of a heat exchanger, wherein exhaust gas generated from combustion of fuel gas in the internal combustion engine flows through the exhaust line and the reformer and then is discharged from an exhaust turbine; the exhaust turbine takes in air from an air pipeline while discharging exhaust gas; and the air pipeline is connected to a second tee valve; characterised in that the second tee valve is connected to an air preheater, and the air preheater is connected to the heat exchanger; an air pipeline connected to an output end of the heat exchanger is connected to a second input end of the SOFC stack; air is input to the inside of the SOFC stack through the air pipeline and discharged from an air pipeline connected to a second output end of the SOFC stack; the air pipeline connected to the second output end of the SOFC stack is arranged adjacent to the outer wall of the air preheater; and the second tee valve is further connected to a third input end of the internal combustion engine to provide air for the internal combustion engine. a first input end of the internal combustion engine is connected to a first output end of a first tee valve; an input end of the first tee valve is connected to a fuel gas feeder; a second output end of the first tee valve is connected to a first input end of a reformer; an output end of the reformer is connected to a first input end of the SOFC stack; a first output end of the SOFC stack is connected to a second input end of the internal combustion engine; an output end of the internal combustion engine is connected to an exhaust line, which is arranged adjacent to an outer wall of a heat exchanger, wherein exhaust gas generated from combustion of fuel gas in the internal combustion engine flows through the exhaust line and the reformer and then is discharged from an exhaust turbine; the exhaust turbine takes in air from an air pipeline while discharging exhaust gas; and the air pipeline is connected to a second tee valve; characterised in that the second tee valve is connected to an air preheater, and the air preheater is connected to the heat exchanger; an air pipeline connected to an output end of the heat exchanger is connected to a second input end of the SOFC stack; air is input to the inside of the SOFC stack through the air pipeline and discharged from an air pipeline connected to a second output end of the SOFC stack; the air pipeline connected to the second output end of the SOFC stack is arranged adjacent to the outer wall of the air preheater; and the second tee valve is further connected to a third input end of the internal combustion engine to provide air for the internal combustion engine.