Catalyst plays an important role in the production efficiency of products in chemical production. Some catalysts need to be calcined and heated in the process of production and manufacturing, and the traditional heating method generally uses resistance wire for heating. However, using resistance wire heating cannot reach the required temperature in a short time, and it is difficult to accurately control the temperature and heating area. Therefore, a new selective laser heating method is proposed in this paper. Firstly, the laser beam shaping is simulated by Zemax software to achieve the actual catalyst heating requirements of 200 mm2 light output area and uniform energy density (5 W/cm2) in the area. Secondly, a set of bearing device is designed to realize modular disassembly and assembly of laser, lens holding device and test tube clamping device, which is convenient for subsequent replacement and maintenance. Finally, a set of temperature detection and control scheme is proposed. Through Ansys simulation of Gaussian light source heating, it is found that the heat source power is linearly related to the maximum temperature of catalyst material receiving hot spot. The appropriate parameters of PID control laser power and temperature are obtained by using Simulink simulation PID algorithm in Matlab.