The invention discloses an organic fertilizer reaction device. The organic fertilizer reaction device comprises a reaction tank, wherein a vertical stirring shaft is arranged in the center of the reaction tank; the stirring shaft is provided with stirring blades; a discharging hole is formed in the middle of the lower bottom surface of the reaction tank; a vent hole is formed below the side wall of the reaction tank; a vent hole is formed in the outer side of an upper top plate of the reaction tank; a feeding hole is formed in the middle of the upper top plate; a conveying pipeline which is placed obliquely is arranged above the reaction tank; an auger is arranged in the conveying pipeline; a feeding hole is formed in the lower part of the conveying pipeline; a water outlet is formed in the bottom surface of the lower part of the conveying pipeline; a blanking hole is formed in the upper part of the conveying pipeline; and the blanking hole is connected with a feeding hole above the reaction tank. By adopting the organic fertilizer reaction device, the reaction time of an organic fertilizer is shortened, and the fermenting time of the organic fertilizer in one tank is only about one week in general.