An auxiliary pressure drop cumulation metering pusher for the water meter belonging to the art of the water metering apparatus solves the problem of effectively metering the drop cumulation by improving the water flowing velocity of the drop cumulaton metering. The integral auxiliary pressure drop cumulation metering pusher consists of three portions, a tubular main body portion (1), a left sub-unit (6) detachably and sealing connected with the left port (3) of the main body (1),wherein the tubular port (9) of the main board (8) is provided with an inverted device (10) and the inner chamber (5) of the main body (1) is provided with the inverted valve board (26) and the corresponding units, and an automatic exhausting thrust booster unit (11) connected with the side port (4) of the main body (1) which is provided with an outer cylinder (12) equipped with a sealing gasket (16) sliding up and down and the corresponding units inside. The utility model has the advantages that it is capable of increasing the water storage spacing by the impulse inertia of the water current when the inverted board (26) is suddenly opened thereby being capable of suddenly increasing the water flowing velocity and being enough to push the water meter for the effective metering of the drop cumulation. The utility model has good interference immunity to the impurities and is easy to manufacture, to mount, to adjust and to use. The units of the utility model have good interchangeability and are long in service life, particularly applicable to the metering of the pure water supplied by the pipe network, which is capable of avoiding large economic loss for the companies and saves water resource and water energy source.