The invention relates to an installation method of line arresters for lighting protection of a 10 kV common-tower double-circuit line. A plurality of base towers are arranged in the 10 kV common-tower double-circuit line. According to the installation method, five line arresters are arranged on one base tower, the five line arresters are connected with any five phases of a six-phase insulator of the corresponding base tower in parallel, and the line arresters are metallic oxide line arresters. Compared with the prior art, the installation method has the advantages that the lightning trip-out rate and the lighting disconnection rate can be reduced effectively, and the workload of construction can be reduced.