The invention discloses a service plate turnover device. The service plate turnover device comprises a service plate conveyor A, a meal collecting groove, collecting barrels, a plate service conveyorB and a service plate collecting trolley, wherein the meal collecting groove is installed below the service plate conveyor A, and the meal collecting groove is divided into four single grids; and theservice plate conveyor B is installed above the third single grid and the fourth single grid, the collecting barrels are installed in the single grids of the meal collecting groove, an inclined sliding plate is arranged on one side of the service plate conveying machine B, and the service plate collecting trolley is arranged at the lower part of the inclined sliding plate. According to the device,a magnet is arranged on the service plate conveyor A, the service plate is attracted by the magnetic force, the service plate is enabled to be turned over in a moving process, residual food in the service plate is poured into the collecting barrels, the automation can be realized in a whole process, so that the working efficiency is improved, the labor intensity is reduced, and the device is particularly suitable for all enterprises, unit and a canteen of school, and the recovery and clearing speed of the service plate can be greatly improved.