The utility model discloses a bottle sorting mechanism. The bottle sorting mechanism comprises a conveying device, a bottle isolation device and a bottle blocking device, wherein the conveying device comprises a plurality of drums and a plurality of separating plates arranged on the drums; conveying channels are formed between adjacent separating plates; the bottle isolation device comprises door plates arranged at the front end of each conveying channel and driving mechanisms for controlling the door plates to be opened and closed; the bottle blocking device comprises blocking rods, driving chain wheels, driven chain wheels, speed change mechanisms for driving the driving chain wheels to move alternatively at high and low speeds, and chains for connecting the driving chain wheels with the driven chain wheels; the blocking rods are arranged on the chains; the chains are of closed-loop square structures; the tops of the chains are higher than the heights of bottles; one side of each chain is arranged at the front end of each conveying channel; the other sides of the chains are arranged at the back ends of the conveying channels. The bottle sorting mechanism has high adaptability; after the change of bottle specifications, only a control signal needs to be changed, and manual adjustment of mechanical equipment is not needed; under the actions of the blocking rods, the bottles are prevented from falling during conveying.