Grain counting machine with screening function for nut packaging machine

The invention relates to the field of food processing, and particularly discloses a grain counting machine with a screening function for a nut packaging machine. The machine comprises a shell, a rotating seat is rotationally mounted on the shell, the shell is fixedly connected with a spiral plate through a connecting piece, the spiral plate and the rotating seat are mounted in a sliding manner, a filter screen is embedded in the rotating seat, a plurality of first convex blocks are arranged on the filter screen, a first conveying belt is arranged at an outlet of the spiral plate, and a box fixedly connected to the shell is arranged at one end, away from the spiral plate, of the first conveying belt. Through the design of the filter screen and the first convex blocks, on one hand, the friction among walnuts can be increased through the rotation of the first convex blocks, so that the walnuts are subjected to friction cleaning, mud on the surfaces of the walnuts is removed in a friction manner, and on the other