The invention discloses an exhaust temperature sensor, comprising a housing (1); the outside of the housing (1) is a structure in a step shape; left and right ends on the outside of the housing (1) are both provided with a segment of external threads; the left end of the housing (1) is also in connection with a segment of heat conducting bar (3); the housing (1) is internally provided with a step hole (11); the step hole (11) is internally provided with a four-core aviation plug (12); the heat conducting bar (3) is internally filled with heat conduction silica gel (32); a PT100 platinum resistor (33) is embedded in the heat conduction silica gel (32), and is in fixed connection with the four-core aviation plug (12). The exhaust temperature sensor is provided with the external threads and the PT100 platinum resistor, thereby improving the stability of temperature measurement and work efficiency, and meanwhile improving the sensitivity of temperature measurement; the exhaust temperature sensor has the characteristics of compact structure, reasonable design, simple processing and easy disassembly and assembly.