The invention discloses a screening feeding device for a conveyer and relates to the technical field of conveyers. The screening feeding device for the conveyer comprises a base, a screening device, an oval wheel, a motor, a connection rod and a synchronous shaft. The screening device is installed on the base and connected with the base and the connection rod through the synchronous shaft. A plurality of limiting bolts are arranged on one surface of the connection rod side by side. The connection rod is connected with the oval wheel. A gear is installed on one surface of the oval wheel. The motor drives the oval wheel to rotate through cooperation of a chain and the gear. The oval wheel rotates, so that the connection rod slides up and down along the limiting bolts so as to drive the screening device to shake up and down. According to the screening feeding device for the conveyer, dust and impurities in grain are screened off through the screening device, and dust is prevented from entering the conveyer and damaging the conveyer; the connection rod is driven by the oval wheel to drive the screening device to shake up and down, a screen net is arranged to be inclined, in this way, the grain is prevented from being accumulated on the screen net, and the screening speed is increased; and since a through groove is formed in one side of the base, dust can be conveniently removed intime, and dust accumulation is avoided.