Granulator for coating grains

The invention relates to a granulator for coating grains. The granulator comprises a hopper, a discharging pipe, a granulating net, granulating nets, a vacuum pump, a vent pipe, a stander, a butterfly valve and a separation tank, wherein the hopper and the vacuum pump are mounted on the stander, the lower end of the hopper is communicated with the discharging pipe through a butterfly valve, and a suction hole is formed in the side wall of the upper end of the hopper and is connected with the vacuum pump through the vent pipe; the separation tank is mounted on the vent pipe. The granulator is characterized by further comprising a sealing cover and a granulating bent pipe, wherein the bending angle of the granulating bent pipe is less than or equal to 90 degrees, the sealing cover is mounted at the upper end of the hopper in a sealing way, the granulating bent pipe is mounted on the sealing cover, an upper port of the granulating bent pipe vertically faces upwards and is located outside the hopper, and a lower