Pulse laser cleaning of porcelain insulator surface pollution will produce strong thermal effect, and the analysis of temperature characteristics in the cleaning process is very important. In this paper, the contaminated porcelain insulator is taken as the research object. By the method of simulation and experiment, the change rule of temperature field under different typical pollution, different pollution water content, different laser energy density and wavelength are studied. The results show that the temperature is directly proportional to the pollution water content, laser energy density and inversely proportional to the laser wavelength, and the laser wet cleaning is more efficient than the dry cleaning. Under the premise of ensuring the thermal stability of insulator ceramic material, the laser energy density is 2.52~3.81 J/cm², and the scanning speed is 1 000 mm/s, which will not damage the insulator base material and can achieve the best cleaning.