The utility model discloses an auxiliary device for opening a well lid of a cable access well. The well lid comprises a well lid body, a wellhead frame and a hydraulic cylinder. Wherein the well mouthframe is installed at a well mouth of a cable access well, one end of the well lid is hinged to the outer side wall of the well mouth frame, at least one groove frame is installed on the inner side wall of the well lid, an installation frame corresponding to the groove frame is installed on the inner side wall of the well mouth frame, a hydraulic cylinder is hinged to the groove frame, and a hydraulic rod of the hydraulic cylinder is hinged to the corresponding installation frame. According to the utility model, after the well lid of the cable access well is unlocked; the hydraulic rod can apply a pushing force to the well lid; workers are assisted to open the well lid; the intensity of workers is reduced; the problem that a worker is strenuous to open the well lid is solved; the hydraulic cylinder and the hydraulic rod can support the well lid after the well lid is opened, so that the well lid is slowly closed when the well lid is closed, the well lid is prevented from being directlyclosed under the gravity of the well lid, the well lid is prevented from deforming due to impact, and the service life of the hinge and the service life of the pivot are guaranteed.