The utility model discloses a secondary circuit auxiliary device that works a telephone switchboard, including base, sinle silk fixed head and handheld support, being provided with a plurality of fibre core fixed heads on the base, setting up handheld support on the base, the both ends of sinle silk fixed head are equipped with the draw -in groove, and are provided with the round hole on the corresponding base in sinle silk fixed head both ends. Pass through the sinle silk fixed head during use and fix the sinle silk on the base, will strand cable core quickly separating through handheld support's rotation, draw to stretch the sinle silk through stretching of handheld support and straighten together to improve greatly in the secondary circuit wiring broken strand with the efficiency of stretching two steps on the line, guarantee that the wiring is pleasing to the eye, and use manpower sparingly.