The three-in-one filling machine is mainly used in the beverage filling process. The fully automatic machine combines washing, filling and cap-screwing together in an entire mechanism, and holds good for carbonated drink filling of polyester bottles and PET bottles. It can be used for all kinds of bottle shapes. The bottleneck-grabing technology makes the process of changing bottles easily by only regulating the height of the conveyer chain. Adopt the micro-pressure filling technology and the constant-pressure water supply system, which makes the filling process faster and more stable. Compared with other equipments of the same kind, this machine possesses a better quality and thus enjoys a high cost-performance.