Abstract: The temperature of the brake is a key factor affecting brake failure.A three-dimensional model of a caliper disc brake with a rated lifting capacity of32 T is built for the research and analysis of the temperature field of the brake.Meanwhile，various parameters of the brake material，the setting of contact relationships between friction pairs，the application of loads and constraints on the brake disc and brake lining are added to the workbench to simulate the temperature field generated during the braking process of the brake.The LM algorithm is employed to establish a multivariate nonlinear mathematical model based on time，friction coefficient，braking pressure，and initial speed.Regression analysis is made by using Matlab，and our fitting results are basically consistent with finite element simulation，demonstrating the correctness of the crane brake temperature model.