The invention discloses a food encasing device with an automatic screening and counting function. The device comprises air cylinders, a second encasing device, discharging pipes, storage cases, a base, a controller, receiving hoppers and hydraulic cylinders. The air cylinders are utilized for driving piston rods to stretch, and accordingly, baffles are pushed to move upwards; by arranging the second encasing device, food at the top of a holding plate is pushed to fall into the receiving hoppers, the food entering the receiving hoppers further falls into the storage cases through the corresponding discharging pipes, accordingly, the food with the qualified weight is automatically encased, manpower encasing is not needed, and the manual labor is greatly saved; the food passing through the discharging pipes blocks infrared rays emitted by infrared emitters, accordingly, the purpose that the food with the qualified weight is counted automatically is achieved, and operation is easy; and byarranging a first encasing device and the second encasing device, the food with the qualified weight and food with the unqualified weights are automatically encased and counted in a classified mode, and the practicability of the equipment is improved.