The invention relates to an automatic filling machine for beverage bottles. The automatic filling machine for the beverage bottles comprises a rack, a conveying chain, a conveying motor, a guardrail,a flushing device, a liquid injection device and a gland device, wherein the liquid injection device comprises a liquid injection rack, a bottle inlet and outlet guide device is arranged on the liquidinjection rack, the bottle inlet and outlet guide device comprises a bottle guide groove, a bottle outlet turntable and a bottle inlet turntable, the liquid injection device further comprises a liquid injection turntable, a liquid injection bottle clamping rotating ring is arranged on the liquid injection turntable, a liquid injection gun is connected to the liquid injection turntable through a liquid injection telescopic supporting rod, the liquid injection gun comprises a vacuum suction pipe connected with the telescopic supporting rod, the upper part of the vacuum suction pipe is providedwith a suction pipe joint, a liquid injection pipe is arranged in the vacuum suction pipe, and the upper part of the liquid injection pipe penetrates through the vacuum suction pipe and is connected to a liquid injection box. According to the automatic filling machine for the beverage bottles, the liquid injection gun is designed to be a structure in which the liquid injection pipe is sleeved withthe vacuum suction pipe, when the liquid injection gun is inserted into bottle bodies, the liquid injection of the beverage bottles in the vacuum state can be realized, meanwhile, the beverage bottles are adsorbed on the liquid injection gun, the centrifugation in the rotating process is avoided, the structural cost of the turntables is saved, and the matching difficulty is reduced.