Neutralization tank

The utility model relates to a neutralization tank which comprises a tank body provided with a water inlet and a water outlet, the inner wall of the tank body is fixedly connected with a supporting shaft, and the supporting shaft is rotationally sleeved with a rotating disc covering the water outlet all the time; a plurality of mounting holes are formed in the rotating disc, filter screens covering the water outlet are mounted on the mounting holes, and the filter screens can be aligned to the water outlet one by one in the rotating process of the rotating disc; and a locking mechanism for locking the position of the rotating disc when the filter screen is over against the water outlet is arranged between the supporting shaft and the rotating disc. When more fibers are attached to the filter screen, an operator rotates the rotating disc to drive the filter screen on the rotating disc to rotate, and when the next filter screen rotates to the water outlet, the locking mechanism can lockthe position of the rotat