In order to analyze the temperature distribution during radio frequency defrosting of surimi quickly, based on the dielectric properties and thermophysical parameters of pollack surimi, a numerical simulation during radio frequency defrosting of pollack surimi was carried out by COMSOL Multiphysics software, the finite element method was used to solve the electromagnetic wave dissipation and heat transfer coupling equation, and the mathematical model was verified by experiment. The results show that the temperature distribution of the upper surface, middle layer and lower surface of the surimi was the same. The numerical results agreed with the experimental results. The cold spot of each layer was always located in the center of the surimi, while the hot spot was always located in the corner area of the surimi. The temperature of the middle layer of the surimi was significantly lower than that of the upper and lower surfaces, and the temperature of the upper surface of the surimi was higher than that of the lower surface. In terms of the heating rate, the monitoring points located in the center of the surimi were the slowest, while those located in the corner area of the surimi were the fastest. Most of the measured temperature values of 9 monitoring points in the surimi sample fell on the simulated temperature change curve. By comparing the experimental value with the measured, it was shown that the COMSOL Multiphysics software could well simulate the temperature change during radio frequency heating, which could be used to predict the temperature distribution of the material.