Plastic bottle assembling production line and plastic bottle assembling method

The invention discloses a plastic bottle assembling production line and a plastic bottle assembling method. The plastic bottle assembling production line comprises a bottle cap conveying mechanism, a bottle cap guiding mechanism, a bottle body conveying track and a bottle cap twisting mechanism. The bottle cap conveying mechanism comprises a bottle cap conveying track; the bottle cap guiding mechanism comprises a guiding shell arranged at the end of the bottle cap conveying track, and the bottle cap conveying track can convey bottle caps on the bottle cap conveying track into the guiding shell. The bottle body conveying track is positioned below the guide shell; the bottle cap twisting mechanism comprises a support arranged on the bottle body conveying track, a plurality of pressing rollers are arranged on the support in a displacement mode in the vertical direction, so that the pressing rollers can abut against the upper end faces of the bottle caps, twisting belts are rotationally arranged on the two sides