The utility model provides a special-purpose tool for measuring insulator creep distance; a surface of the insulation is provided with a groove; the special-purpose tool comprises a measuring tape and a fixing support; the fixing support is vertically provided with a first roller and a second roller arranged at intervals; the first roller is positioned on a front end portion of the fixing support, and abuts against a bottom of the groove; the measuring tape wraps on the second roller so as to conveniently measure a surface creep distance of the insulator, thereby improving measuring precision.