The invention discloses an adjustment device used for a pointer during water meter assembly. The adjustment device comprises a material distribution device and a rotating and arranging device. The material distribution device comprises a transition block used for being connected with an inclined feed passageway (9), a slide plate (3), a stop piece (4), a slippage cylinder (5) and an ejection cylinder (6). The rotating and arranging device comprises a second support (12), a rotating cylinder (13) and a clamping cylinder (14). When the rotating cylinder (13) drives a swing plate (15) to rotate to be in the horizontal state and the slippage cylinder (5) ejects the slide plate (3) to make a second vertical P-shaped hole of the slide plate (3) right opposite to an ejection strip (11) of the ejection cylinder (6), a P-shaped blind hole (25) communicates with the second vertical P-shaped hole. When a push strip (27) supports a pointer body in a long notch (17), a push head (26) makes a cover plate (20) leave the portion above the long notch (17). The device can automatically distribute materials and arrange a pointer to be in the horizontal direction, and the pointing angle is unique.