The design requirements for temperature alarm circuits suitable for electronic process internship courses have been proposed, and an expanded design has been proposed based on students’ different abilities. The design scheme, calculation, experimental result analysis, and fault diagnosis analysis of the circuit were introduced. In the classroom teaching of temperature alarm design, students cooperated to contribute design ideas actively, which promoted students’ abilities of team cooperation and innovation, cultivated their abilities of analyzing and solving problems, and laid a solid foundation for future scientific research work.