A fuel cell overheating protection system, comprising: a fuel gas isolation valve, a flow control unit, a combustor, a first controller, a second controller, a first temperature sensor, a second temperature sensor, a first switch K1, and a second switch K2; wherein: the fuel gas isolation valve controls the on/off state of a fuel gas pipeline; the flow control unit controls the supply volume of fuel gas; the combustor provides heat for fuel cell reaction based on a high temperature gas generated after ignition of the input fuel and air; the first temperature sensor is connected to the combustor and measures the temperature of the high temperature gas generated from combustion in the combustor; the second temperature sensor is connected to the combustor and measures the temperature of the high temperature gas generated from combustion in the combustor; the first switch K1 and the second switch K2 are connected in series in a power circuit of the fuel gas isolation valve to control the power on/off state of the fuel gas isolation valve; the first switch K1 and the second switch K2 are also connected in series in a power circuit of the flow control unit to control the power on/off state of the flow control unit; the first controller is connected to the first temperature sensor and controls the first switch K1 to be disconnected when the temperature detected by the first temperature sensor is not lower than a preset temperature threshold; and the second controller is connected to the second temperature sensor and controls the second switch K2 to be disconnected when the temperature detected by the second temperature sensor is not lower than the preset temperature threshold. a fuel gas isolation valve, a flow control unit, a combustor, a first controller, a second controller, a first temperature sensor, a second temperature sensor, a first switch K1, and a second switch K2; wherein: the fuel gas isolation valve controls the on/off state of a fuel gas pipeline; the flow control unit controls the supply volume of fuel gas; the combustor provides heat for fuel cell reaction based on a high temperature gas generated after ignition of the input fuel and air; the first temperature sensor is connected to the combustor and measures the temperature of the high temperature gas generated from combustion in the combustor; the second temperature sensor is connected to the combustor and measures the temperature of the high temperature gas generated from combustion in the combustor; the first switch K1 and the second switch K2 are connected in series in a power circuit of the fuel gas isolation valve to control the power on/off state of the fuel gas isolation valve; the first switch K1 and the second switch K2 are also connected in series in a power circuit of the flow control unit to control the power on/off state of the flow control unit; the first controller is connected to the first temperature sensor and controls the first switch K1 to be disconnected when the temperature detected by the first temperature sensor is not lower than a preset temperature threshold; and the second controller is connected to the second temperature sensor and controls the second switch K2 to be disconnected when the temperature detected by the second temperature sensor is not lower than the preset temperature threshold. the fuel gas isolation valve controls the on/off state of a fuel gas pipeline; the flow control unit controls the supply volume of fuel gas; the combustor provides heat for fuel cell reaction based on a high temperature gas generated after ignition of the input fuel and air; the first temperature sensor is connected to the combustor and measures the temperature of the high temperature gas generated from combustion in the combustor; the second temperature sensor is connected to the combustor and measures the temperature of the high temperature gas generated from combustion in the combustor; the first switch K1 and the second switch K2 are connected in series in a power circuit of the fuel gas isolation valve to control the power on/off state of the fuel gas isolation valve; the first switch K1 and the second switch K2 are also connected in series in a power circuit of the flow control unit to control the power on/off state of the flow control unit; the first controller is connected to the first temperature sensor and controls the first switch K1 to be disconnected when the temperature detected by the first temperature sensor is not lower than a preset temperature threshold; and the second controller is connected to the second temperature sensor and controls the second switch K2 to be disconnected when the temperature detected by the second temperature sensor is not lower than the preset temperature threshold.