The invention relates to the technical field of agricultural and sideline product production and planting equipment, and particularly discloses a seeding device with a uniform discharging effect for corn planting. The seeding device comprises an outer box body and an inner box body fixedly arranged along a central axis in the outer box body, wherein a pesticide mixing part is arranged in the innerbox body along the central axis, and a uniform discharging part is arranged at the bottom of the inner box body; the bottom of the outer box body is also provided with a uniform fertilization part surrounding the periphery of the uniform discharging part; the uniform discharging part comprises a transverse discharging barrel communicated with the cavity in the bottom of the inner box body througha discharging pipe, and a discharging roller is rotatably arranged in the transverse discharging barrel; the discharging roller is provided with a storage tank, and the bottom of the transverse discharging roller is communicated with a discharging opening. According to an embodiment of the invention, the pesticide mixing effect of wheat seeds can be further improved; the discharging roller rotates for one circle in the transverse discharging barrel, and a small amount of wheat seeds are discharged from the discharging opening under the conveying effect of the storage tank, so that an effect of intermittently and uniformly sowing the wheat seeds is achieved.