Water meter with sealing plate provided with square notch

The utility model discloses a water meter with a sealing plate provided with a square notch, which comprises a meter shell, an impeller box, an impeller and the sealing plate, a first cylinder wall is arranged at the center of one side of the sealing plate back to the meter shell, the square notch is arranged on the first cylinder wall, and a triangle arrow mark is arranged on the first cylinder wall. A magnetism isolating groove used for containing a magnetism isolating ring is formed in the edge tightly attached to the wall of the first cylinder. The first cylinder wall is arranged in the center of the face, back to the meter shell, of the sealing plate, the square notch is formed in the first cylinder wall, the mark of the triangular arrow is arranged on the first cylinder wall, and the relative position of the impeller box and the sealing plate can be adjusted after the square notch is fixed so that the precision of the water meter can be calibrated. And the length of the square notch is far greater than