The invention discloses a double-axis adjustable vertical seam type fish way and an operation method thereof. The double-axis adjustable vertical seam type fish way disclosed by the invention comprises a side wall, a bottom plate, a gear track, a longitudinal gear, a plurality of pairs of baffles, a
buttress, a horizontal gear, a water through hole capable of adjusting the opening degree, a fish through gallery and an
operation room; the gear track is positioned on the wall surface, near one side of a
pool chamber, of the side wall; the longitudinal gear is positioned on the gear track and can move along the gear track; the baffles are divided into long baffles and short baffles alternatively arranged on the side wall sequentially and spaced at a certain distance; furthermore, the long and short baffles are arranged in pair in the direction vertical to
water flow; the water through hole capable of adjusting the opening degree and the fish through gallery are positioned over the baffles; the baffles are connected with the
buttress through shafts and the horizontal gear; the
buttress and the side wall are connected through the longitudinal gear. According to the double-axis adjustable vertical seam type fish way and the operation method thereof disclosed by the invention, the fish through gallery is separated from an energy dissipation zone; a steady flow pattern is provided for the fish through gallery, so that the fish through gallery is not influenced by the energy dissipation zone, and therefore, the problems of being bad in
water flow condition at the fish through gallery and fish through effect and incapable of being applied to relatively high water head difference are solved.