The invention discloses an insulator with a wire fixing device and belongs to the field of power transmission devices. The insulator mainly comprises an insulator body, wherein a screw is arranged inthe insulator body; a cushion pad is arranged at the top of the screw; umbrella skirts are arranged at the upper part and the lower part of the insulator body separately; a wire fixing column is arranged between the upper umbrella skirt and the lower umbrella skirt; a groove A is formed in the wire fixing column; U-shaped connectors are arranged at two sides of each umbrella skirt separately; twoends of each U-shaped connector are fixedly connected with the corresponding umbrella skirt; one adjusting rod is arranged between two upper and lower corresponding U-shaped connectors; two ends of each adjusting rod are connected with the corresponding U-shaped connectors through limiting devices; a wire fixing block capable of moving up and down is arranged on each adjusting rod; and a groove Bmatched with the groove A is formed in each wire fixing block. According to the insulator, an electric wire is convenient and fast to install; the insulator is low in technical requirements on an installer, and firm and reliable in installation; the working time is greatly shortened; and the work efficiency is improved. The insulator is mainly used for fixing the electric wire.