The invention provides a construction method for anchoring a catwalk and a catwalk anchoring device, belongs to the field of engineering equipment, and aims at anchoring the catwalk on a front supporting pier of a cable saddle. The method comprises the following steps: pouring the front supporting pier; mounting an anchoring system on the front supporting pier; mounting a catwalk adjusting system on the anchoring system, wherein the catwalk adjusting system is connected to the catwalk. The anchoring device comprises the anchoring system and the catwalk adjusting system, wherein the anchoring system consisting of a vertical frame and an inclined support is mounted on the front supporting pier; the vertical frame is connected to one end of the inclined support; the vertical frame and the other end of the inclined support are mounted on the front supporting pier; one end of the catwalk adjusting system is connected to the vertical frame while the other end of the catwalk adjusting system is connected to the catwalk. According to the construction method, an anchoring point of a catwalk bearing cable is arranged on the front supporting pier; compared with a manner of anchoring on a rear anchoring block, the method has the advantages that the construction is sped up, the cable saddle is not arranged on the front supporting pier, and the superiority is obvious.