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. <EOS>