Abstract: Based on the theory of magnetic-thermal bidirectional coupling, the 3D nonlinear high-frequency induction brazing temperature field model of the polycrystalline diamond compact (PDC) tool is established with COMSOL Multi-physics software. The PDC temperature field of high-frequency induction brazing is calculated and then verified by experiment designed in accordance with the model to analyze the law of temperature change at brazing position. The results show that the variation of PDC brazing temperature is approximately linear before it reaches 700 ℃. The effective temperature of the brazing can be reached when the PDC is heated for about 12 s. Within the effective temperature range of brazing, the error between the actual temperature value of brazing position measured in the experiment and the caculated is less than 5%. The brazing parameters can be determined on the basis of this model.