The invention discloses an automatic production line for assembling a metal lifting handle on a plastic bucket. The automatic production line for assembling the metal lifting handle on the plastic bucket comprises a positioning device, a lifting handle installing device and a pinch device, wherein the positioning device comprises a rotary disc and an installing hole sensor, the rotary disc is driven by a rotary drive device to rotate, the installing hole sensor is arranged on the side face of the top of the rotary disc, the installing hole sensor and lifting handle installing holes in a bucketbody are set in an equal altitude mode, the lifting handle installing device is arranged on the rear side of the positioning device, the lifting handle installing device comprises an installing tableused for placing the bucket body, a left clamping jaw and a right clamping jaw, the left clamping jaw and the right clamping jaw are correspondingly arranged on two sides of the installing table, theleft clamping jaw and the right clamping jaw are driven by an insertion installing drive device to move close to or far away each other, and used for clamping two ends of the lifting handle and inserting the two ends of the lifting handle into the lifting handle installing holes, the pinch device is arranged on two sides of the positioning device and two sides of the lifting handle installing device, and the pinch device is used for pinching the bucket body from the rotary disc to the installing table. The automatic production line for assembling the metal lifting handle on the plastic bucketcan automatically identify the orientation of the installing holes, and then rotates the bucket body until the lifting handle installing holes are under a state of facing designated positions, and performs automatic installation of the metal lifting handle.