The invention discloses a gantry crawling ladder. According to main points in a technical scheme, the gantry crawling ladder comprises a ladder body and a plurality of support rings, wherein the ladder body is installed on one side of a supporting leg of a gantry; the plurality of support rings are arranged at intervals along the length direction of the ladder body; protective space is formed between every two adjacent support rings respectively located at upper and lower positions; the side walls of, close to the protective space, of every two adjacent support rings respectively located at upper and lower positions are provided with a plurality of concentric annular sliding grooves; the protective space is internally provided with protective devices; the protective devices comprise protective sheet groups; the protective sheet groups comprise sliding pieces in one-to-one correspondence to the sliding grooves; the upper and lower ends of the sliding pieces are slidably arranged in andconnected with upper and lower opposite sliding grooves respectively; and flexible protective nets arranged between and connected with every two adjacent sliding grooves. The gantry crawling ladder further comprises a driving part which is used for driving the sliding pieces to slide along the sliding grooves. The structure of the above-mentioned gantry crawling ladder has both safety and wind resistance, and is highly practical.