Based on the principle of heat transfer, the advanced multi-physics simulation software Comsol Multiphysics 5.3 awas used to simulate the thermal shock of granite at different temperatures by using ambient temperature water, liquid carbon dioxide and liquid nitrogen as working fluids, and the granite thermal shock test was carried out under the same conditions.The simulation results show that the temperature field of granite under the thermal shock is propagated by shock wave.The larger contact area of the working medium, the faster temperature field propagates.The thermal equilibrium time prolongs with the decrease of the working medium temperature, and a temperature threshold exists between 400℃and 500℃ which maybe cause a phase change.The thermal shock velocity increases with the increase of the initial temperature, and the temperature gradient increases first and decreases with the increase of time.The larger temperature gradient and the stronger thermal shock, the more heat loss in the rock.The thermal shock temperature change curve can be divided into three phases:temperature acceleration change phase, temperature deceleration change phase and temperature stabilization phase.The experimental results show that the numerical simulation can supplement in the physical experiment.