The invention discloses a grain drying machine with a circular drying function. The machine comprises supporting legs, the top ends of the supporting legs are fixedly connected with a drying box, theside face of the drying box is fixedly connected with a spiral elevating chamber, the bottom of the inner wall of the drying box is fixedly connected with a supporting column, the surface of the supporting column is fixedly connected with a sliding way, the inner wall of the drying box is fixedly connected with a heating pipe, the bottom end of the spiral elevating chamber is fixedly connected with a hopper, the bottom end of the hopper is fixedly connected with a stop valve, and the top end of the spiral elevating chamber is fixedly connected with a motor support. Grain is input into the drying box, grain slides downwards along the sliding way by means of gravity, the heating pipe carries out heating and drying, the grain slides into the hopper through the bottom end of the sliding way, amotor drives a screw to rotate, grain in the hopper is elevated upwards, after the grain is elevated to the top end and enters the top end of the sliding way again from the interior of a second through hole, the reciprocated circular drying effect is achieved, the grain can be more evenly dried, and the grain drying can be more thorough.