The invention discloses a fixed base for suspending a live-working scaling ladder on a transmission tower. The fixed base comprises a support steel tube, a sleeve and a suspending device. One end of the support steel tube is provided with a suspension rod. Fixed rings are arranged on the front and rear sides of the sleeve and horizontal connecting rods are hinged on the fixed rings. A connecting ring is arranged on the right side of the sleeve. The suspending device comprises a plate-like suspension hook and a locking mechanism. The plate-like suspension hook comprises a back plate and a hook body. The back plate is provided with upper and lower connecting lugs and a fixed cover. The locking mechanism comprises a horizontal support rod, an adjustable nut and a locking hook. The support steel tube is fixedly connected with the suspending device through a vertical bolt. The horizontal connecting rods are positioned by two nuts arranged on both sides of the back plate and a fastening bolt. The fixed base is convenient to use, the hook body is hanged on an angle iron of the transmission tower during the operation, then the hook body is fastened by the locking mechanism, and one end of the scaling ladder is connected on the suspension rod. The scaling ladder can rotate up and down and left and right and is good in adaptability.