Construction supporting platform and method suitable for cantilever type cover beam prestress tensioning

The invention belongs to the technical field of cover beam tensioning construction, and relates to a construction supporting platform and method suitable for cantilever type cover beam prestress tensioning, and the supporting platform comprises a small door type supporting frame structure, a large door type supporting frame structure, a bearing beam structure, a sliding rail structure, a sliding rod structure, a tensioning construction platform and a crawling ladder; the small door-shaped supporting frame structure and the large door-shaped supporting frame structure are connected through the bearing beam structure and the sliding rail structure to form a frame stabilizing structure. The sliding rail structure is connected to the bearing beam structure. The pulley of the sliding rod structure can move on the sliding rail of the sliding rail structure; the bearing beam structure is fixedly connected with the gate type supporting frame structure through a first inclined strut, and the tensioning construction pl