Abstract: Objective In order to concentrate magnetic field of induction coil at the junction between cemented carbide and steel matrix, improve heating efficiency, a special coil mechanism suitable for motion continuous brazing was designed. Methods Based on Maxwell’s equations and temperature differential equations, a finite element mathematical model for the coupling of electromagnetic field and temperature field was established. Through finite element software Ansys Maxwell, a mathematical model for the coupling of electromagnetic field and temperature field between induction coil and welded workpiece was established. The magnetic field distribution intensity of the designed induction coil and temperature field distribution of welded area were calculated and simulated. Results A large number of welding experiments were conducted by a self-developed construction drill bit brazing equipment. By measuring temperature of welding area and comparing it with simulation values, it was verified that simulation values were in good agreement with measured values. Conclusion The research results of this article could provide theoretical basis for the design of induction coils and the study of electromagnetic field distribution in induction coils, and provide technical reference for improving brazing process of hard tools and improving temperature field distribution in brazing area.