Fishway vault movable formwork support and shifting method

The invention discloses a fishway vault movable formwork support and a shifting method. The fishway vault moving formwork support comprises a vault support, a lower supporting frame and a walking trolley, the two ends of the lower side of the vault support are supported at the two ends of the lower supporting frame, and the two sides of a movable frame of the walking trolley are supported on a pair of steel channel rails through a plurality of supporting wheels correspondingly; the vault support comprises a plurality of arch rib combinations which are vertically arranged at intervals and a plurality of longitudinal supporting steel pipes, and the longitudinal supporting steel pipes are distributed at intervals along the inner sides of semicircular arch rib combinations and welded to the arch rib combinations to form the vault support; and the length of the movable frame is matched with that of the lower supporting frame, and the bottom of the lower supporting frame is supported at thebottom of the fishway thr