The invention relates to an automatic cleaning and drying system for an insulator mandril. The system that is installed after a grinding process of an insulator mandril comprises a cleaning machine and a drying machine. A grinding machine is arranged at the front side of the system. The insulator mandril is an epoxy glass fiber core body. The system is characterized in that the system comprises a rack, a spiral transmission roller, a liquid storage tank, a liquid spraying pipe, a driving motor, a plunger pump and a drying machine. With the automatic cleaning system and ethyl alcohol cleaning liquid, the efficiency for cleaning the surface of the mandril is improved, the labor intensity of the worker is reduced, and the work efficiency is improved. Besides, rubber curtains are arranged at the two ends of a glass cover opening, so that cleaning liquid volatilization is reduced. With a liquid collection pipe and a filter net, the recycling efficiency of the cleaning liquid is improved. The driving motor is an explosion-proof motor and a negative-pressure suction ventilator is arranged on the drying machine, so that the ethyl alcohol concentration in the air is reduced and the combustion possibility of organic liquid is reduced.