The utility model relates to a lay the instrument that the secondary cable was used, specifically be secondary cable laying auxiliary device. Secondary cable laying auxiliary device, including the dolly, the toolbox is installed to dolly mesa top, and two main shafts are installed to dolly mesa below, are connected with the main shaft connecting rod between two main shafts, still are provided with horizontal connecting rod on every main shaft, are fixed with cable fastening clip on the connecting rod. The whole dolly pattern that be of the device, the outfit can be deposited to dolly mesa top mounting tool case, the main shaft is located the cable pit during cabling, be fixed in connecting rod cable fastening clip with multiple cable in, promotion dolly, cabling. This auxiliary device can effectively improve work efficiency, reduces intensity of labour, has characteristics such as simple to use, easy maintenance.