The invention discloses a thermoswitch, comprising a housing (1); the lower part in the housing (1) is provided with a disc (2); a ceramic column (3) vertically penetrates the central section of the disc (2); the lower end of the ceramic column (3) is sleeved by a temperature-sensitive bimetallic strip (4); the central section in the housing (1) is embedded by a conductor (5); the top of the conductor (5) is covered by an epoxy resin layer (6); the top of the epoxy resin layer (6) is provided with a positioning cover combination which comprises a cover body (81) and a locating shaft (84); the locating shaft (84) is symmetrically provided with two elastic cards (82). The housing is internally provided with the epoxy resin layer to guarantee sealing performance, and the elastic cards are arranged to guarantee clamping stability; the thermoswitch has the characteristics of reliable and simple structure, high temperature control precision and sensitivity, long service life, stable performance, convenient disassembly and assembly, and wide suitable scope.