In order to satisfy the laser cleaning application for a variety of materials insulators, a self-developed pulsed master oscillator power amplifier (MOPA) fiber laser with a laser energy of 2mJ was adopted. The cleaning of the glass insulator, porcelain insulator, and silicon rubber insulator had been effectively finished by a MOPA laser in this work. Also, the relationships between the cleaning speed, pulsed laser parameters, and cleaning effect of the insulator were analyzed. At the highest laser scanning speed of 10m/s, the cleaning efficiency of 3.4cm2/s could be reached, and the optimized laser parameters of insulators with different materials were studied for provision of reference in electrical insulators laser cleaning application.