Automobile B-pillar automatic assembly production line, including feeding conveyor, automatic assembly machine, and unloading conveyor; Tool rotating device, second jig rotating device, third jig rotating device, fourth jig rotating device, first automatic foam pasting device, second automatic foam pasting device, automatic pasting and sealing device, buckle automatic loading material vibrating plate; the conveying turntable is arranged at the center of the frame platform, and the eight described automobile B-pillar fixtures are evenly distributed in the radial circumferential direction on the conveying turntable to form the first station, the second station, and the third station in turn. station, the fourth station, the fifth station, the sixth station, the seventh station, and the eighth station; the advantage is that through the compact conveying structure, automatic production is realized for each step of the processing procedure.