Abstract: In order to ensure the normal installation of the cable in the special-shaped steel tower cable-stayed bridge and the normal stress of the bridge, the research on the installation technology of the cable in the limited space in the tower is put forward. To solve the problem of insufficient size and cable force demand in the tower, the tower end is used for unrolling and installation, and then the beam is drawn for installation. The upper tensioning end of the tower is drawn into the cable conduit in the tower, and the tensioning end is anchored flat. When the upper end of the tower is anchored, the anchor end is drawn into the cable conduit of the beam end, and the rotating nut makes the anchor end reach the designed position. The cable tensioning is carried out in step by step, and the unilateral tensioning is carried out in line with 30%, 60%, 80% and 100% of the cable force. After the measurement of bridge elevation, cable force and cable tower deviation, the results showed that the elevation of the main girder was within 2cm from the design value. The error between bridge cable force and design value was controlled within 5%. The deviation of the tower was within the range of 2cm from the design value. The construction quality of cable-stayed bridge could be guaranteed effectively by using the construction method of installing the tensioning end at the tower first and then installing the anchoring section at the beam end and using the tensioning cable in the tower by stages.