The invention relates to an automatic fan rib gluing machine for manufacturing fans. The automatic fan rib gluing machine comprises a main hanging bracket, and a movable bearing seat and a fixed bearing seat are respectively fixedly mounted at the lower end of the main hanging bracket; and the movable bearing seat and the fixed bearing seat are commonly rotatably provided with a main mandrel, anda phase change driving device is mounted at the left end of the main mandrel. Screw nuts drive two hairbrushes to horizontally slide, and the control of the alternate engaged transmission of a transforming gear and two reversing gears and the limiting effect of a right angle latch make the two hairbrushes driven to horizontally slip and rotate an angle; and the machine realizes rapid and automaticgluing processing of a large number of fan ribs, saves a lot of manpower and shortens the processing time.