Rotary adjustment weir door device includes: manual wheel, screw, screw sleeve, water stop splint, weir plate, bar magnet, bracket, motor, limit ring and sealing rubber strip, rotary adjustment weir door device installed in the pool outlet between the low and high platform, water stop splint fixed in the pool outlet on both sides of the low platform, bracket fixed on the high platform, weir plate at the bottom of the two sides and the low platform hinged, weir The center of the top of the plate and the screw sleeve is hinged together, in the screw sleeve is equipped with a screw, screw one end out of the screw sleeve, and one end of the screw from bottom to top is equipped with a limiting ring, motor and manual wheel, motor or manual wheel drive screw rotation, screw drive screw sleeve movement, screw sleeve drive weir plate rotation along the low platform, the outer wall of the limit ring and bracket is hinged and fixed in two water stop clip The plate is equipped with at least one strip of magnet, and the sealing rubber strip is fixed respectively on the weir plate between the water stop splat and the weir plate on both sides. The device has good sealing performance and no leakage.