In order to prevent the lens from being broken or burnt during long-term high-power laser cleaning and ensure the service life and stability of the optical head, this paper uses the Solidworks software for structural design and three-dimensional modeling of the collimation system, galvanometer system and focusing lens group in the laser cleaning head, and the feasibility study of the structural parameters of each system of the optical head is carried out. The temperature field simulation is carried out by using ANSYS Workbench, and the reliability of the model design is verified through temperature detection and laser cleaning experiments. Results show that the energy density of the incident light spot of each lens is lower than the corresponding damage threshold, and the temperature variation of each component of the laser head obtained by simulation is within the reliable range. The designed bald head model is reliable, which can meet the working requirements. This paper provides the corresponding theory and method for the independent research and development of high-power laser cleaning heads.