Rotary grain distributor

The invention relates to a rotary grain distributor which comprises a support, a grain leaking barrel with the rotating axis extending in the vertical direction is rotationally assembled on the support, the rotary grain distributor further comprises a grain leaking barrel driving mechanism for driving the grain leaking barrel to rotate, a swing arm with the rotating axis extending in the vertical direction is rotationally assembled at the bottom of the grain leaking barrel, and the rotating axis of the swing arm and the axis of the grain leaking barrel are arranged in parallel. The swing arm is provided with a movable sealing door, the movable sealing door is provided with a closing station used for sealing the center grain outlet and an opening station used for opening the center grain outlet in the swing process of the swing arm, and the swing arm is connected with a swing arm reset spring used for driving the movable sealing door to be located at the opening station when the grain leakage barrel is at the