The utility model relates to a bottle feeding mechanism for a rotary filling machine. The bottle feeding mechanism comprises a bottle feeding star wheel, wherein a plurality of grooves are annularly formed in an outer edge of the bottle feeding star wheel; the grooves are matched with bottle bodies of bottles; a bottleneck star wheel is arranged above the bottle feeding star wheel; the outer edge of the bottleneck star wheel is in contact with the bottlenecks of the bottles. According to the bottle feeding mechanism, the bottleneck star wheel is additionally arranged on the star wheel of the filling machine; when the bottles are fed in the filling machine, the bottleneck star wheel can force to squeeze the bottlenecks in bottleneck clamping blocks directly under a filling valve of the filling machine, and the bottle bodies are kept to be vertical; the long and thin glass bottles can be quickly and accurately fed at filling positions of the filling machine by utilizing the device.