The invention discloses a manufacturing method of an up-down high-altitude construction platform ladder cage. The method is characterized in that the method comprises the steps that S1, an equal angle steel welded ladder cage frame is adopted, and steel wire meshes are used to protect the periphery of the frame; S2, a steel plate welded platform is adopted on the ladder cage frame, and angle iron is adopted for welding steps; S3, handrails are mounted on the steps, and a protective guard is mounted on the top of the ladder cage; S4, paint is painted on the outer surface of the ladder cage frame, the handrails and the protective guard; the platform in the step S2 comprises a first platform which is arranged on the bottom of the frame, a second platform which is arranged on the middle of the frame and a third platform which is arranged on the top of the frame; in the step S3, the mounted protective guard is arranged on the periphery of the third platform. The manufacturing method is low in the cost of manufacturing an upstream and downstream channel and easy and convenient to mount and shift, saves time, and is high in use efficiency, convenient to move and high in speed.