Filling bottle opening positioning clamping block and filling machine

The utility model relates to the field of filling machines, and particularly discloses a filling bottleneck positioning fixture block and a filling machine, the filling bottleneck positioning fixture block comprises a butt joint groove, one end of the butt joint groove is fixedly connected with a connecting plate, and the upper end of the butt joint groove is connected with an upper cover; the two rotating plates are symmetrically and rotationally connected into the butt joint groove, and one ends of the rotating plates extend out of the butt joint groove and are fixedly connected with clamping plates; when the driving mechanism simultaneously drives the two butt joint grooves to be close to the bottle neck, the bottle neck firstly makes contact with the arc-shaped plate at one end of the pushing rod and pushes the arc-shaped plate towards the inner side, the arc-shaped plate pushes the pushing rod to move towards the inner side, and the pushing rod does not push the rear ends of the rotating plates towards t