The invention discloses a peanut grain sorting device which comprises a machine body. A motor is fixedly connected to the right side of the machine body through a supporting plate, a concave frame isfixedly connected to an output shaft of the motor, a transverse plate is movably connected to the top of the concave frame through a bearing block, the left side of the transverse plate and the left side of the machine body are welded, a sleeve is in sliding connection to the surface of the concave frame, and a movable rod is welded to the left side of the sleeve. The peanut grain sorting device is provided with the motor, the concave frame, the transverse plate, the sleeve, the movable rod, a screen, a sliding sleeve and a sliding rod which are matched, and the airing effect on peanut grainsis achieved; and a guide pipe, an electric valve, an electric lifting rod, a push plate, a receiving plate, a first leakage hole, a second leakage hole, a third leakage hole and a time switch are arranged in a matched manner, and therefore the effect of quick sorting of peanut grains is achieved, convenience is brought to collection by machining persons, the working efficiency of the machining persons is improved, and squeezing of the peanut grains is guaranteed.