The large-plate U-turning machine is an auxiliary equipment for adjusting the direction of green billets during the operation of interior wall tiles and floor tiles. The equipment integrates the direction of products coming out of the press and the direction of products entering and exiting the drying kiln, and can obtain the direction conversion of green billets as required. The large-plate U-turning machine adopts helical gear transmission and cam divider positioning. The overall lifting of the rollers can avoid the phenomenon of billet jamming. The size of the rollers and the distribution density of the rollers are determined according to the product specifications and the number of green billets each time. The electronic control is segmented by the PLC program to link the upper and lower processes.