The invention discloses an air-flowing type filling machine with adjustable volume. The air-flowing type filling machine with the adjustable volume is characterized in that a metering disc and an adjusting disc are arranged in a filling wheel, six radial column-shaped metering holes are formed in the metering disc, a round hole is axially formed in the lateral surface of each metering hole, a head face valve is arranged in each round hole, a filter piece is arranged in each metering hole, an Archimedes spiral groove is opened in each metering hole in the head face of the adjusting disc, an adjusting slide block is inserted in each Archimedes spiral groove, and a piston plug is connected between each filter piece and the corresponding adjusting slide block. When regulating the volume of each metering hole, the adjusting disc is regulated to separate the adjusting disc from the metering disc, when there is enough space, the adjusting slide blocks move along the Archimedes spiral grooves, and the adjusting slide blocks drive the filter pieces to move longitudinally so as to change the amount of powder sucked into the metering holes.