The utility model provides a material compaction device of full -automatic bottled liquid filling machine, include the material compression rod, the 2nd material compression rod and the 3rd material compression rod that set gradually along the transport direction of bottle conveyer, a material compression rod, the 2nd material compression rod and the 3rd material compression rod all can stretch into or stretch out the bottle under the drive of driver, a material compression rod lower extreme is provided with crowded pressing cone head, and the diameter from the top down of crowded pressing cone head dwindles gradually, the exhaust chamber that the 2nd material compression rod set up, open side down for the air inlet in exhaust chamber, and gas off -take and external intercommunication are passed through to the exhaust chamber, the inlet set in exhaust chamber has the fender material piston that can move about from top to bottom, the 3rd material compression rod's bottom surface is interior concave surface. The utility model discloses in, successively push down the viscous material in the bottle through a material compression rod, the 2nd material compression rod and the 3rd material compression rod, and then in the discharge bottle or the bubble among the viscous material, avoid viscous material rotten, simultaneously, make viscous material distribute more evenly in the bottle.