The utility model discloses an improved inserted link type temperature controller. The device comprises a base and an upper cover, an adjustable temperature control assembly and a protective temperature control assembly are installed between the base and the upper cover. a temperature adjusting nut is mounted on the adjustable temperature adjusting assembly; a copper pipe is installed at the bottom of the base and internally provided with an alloy core rod. one end of the alloy mandrel is fixedly connected with the bottom of the copper pipe; the other end of the alloy core rod is connected with the temperature adjusting nut; a bimetallic strip linked with the protection temperature control assembly is mounted in the base; a top shell extends from the top surface of the upper cover; the side wall of the top shell comprises an edge arc surface flush with the side wall of the upper cover; a central arc surface close to the central axis of the temperature controller is arranged on the sidewall opposite to the edge arc surface; the top shell between the central arc surface and the edge arc surface is connected through two flat positioning end surfaces, the bimetallic strip is arc-shaped, and the diameter phi of the bimetallic strip is equal to 17mm. The structure increases the length of the positioning end surfaces when the upper cover is installed, so that the installation is moreconvenient and stable, and the bimetallic strip with the diameter enables the temperature controller to control the temperature more stably and accurately.