Plastic bottle processing and assembling production line

The invention discloses a plastic bottle processing and assembling production line which comprises a conveying track, and bottle bodies are arranged on the conveying track at intervals, so that the conveying track can drive the bottle bodies to move in the length direction of the conveying track; a base plate is arranged above the conveying rail, a shaft sleeve is arranged on the base plate, a piston is arranged in the shaft sleeve in a vertically displaceable mode, a rotating disc is rotatably arranged on the base plate, a first hinge piece is fixed to the side face of the rotating disc, and a second hinge piece is arranged at the upper end of the piston. One end of the crank is hinged to the first hinge piece, and the other end of the crank is hinged to the second hinge piece, so that the piston can move up and down to tightly press the bottle plug in the opening of the bottle body. The problems that an existing bottle plug pressing device is low in operation efficiency and cannot conduct cap plugging and s