The invention relates to a fan lightning protection device, in particular to a fan blade lighting protection device. The device comprises a fan blade and a lightning arrester installed on the fan blade. The tip of the fan blade is sleeved with an electric conduction cap, the inner surface of the electric conduction cap is attached to the outer surface of the tip, the electric conduction cap is connected with the fan blade in a fastened mode, and the back of the electric conduction cap and the lightning arrester are connected in an electric conduction mode and assembled in a fastened mode. The fan blade lightning protection device has the advantages of being capable of effectively protecting the tip of the fan blade from being damaged by lightning, good in lightning protection effect, simple in structure, easy and convenient to install and use and good in safety performance.