Double-channel material conveying device, grain collecting and conveying system and harvester

The utility model relates to a double-channel material conveying device, a grain collecting and conveying system and a harvester, the double-channel material conveying device comprises a feeding box and two threshing cylinders, the two threshing cylinders are horizontally arranged side by side, and feeding ports are respectively arranged on the two threshing cylinders; the feeding box is fixedly installed above the two feeding ports, a feeding port is formed in one end of the feeding box, two discharging ports are formed in the lower side of the feeding box, and the two discharging ports are located above the two feeding ports respectively. The double-channel conveying device has the advantages of being simple in structure, reasonable in design, capable of achieving double-channel conveying of materials, even in material distribution, capable of finally sending the residual materials back to the threshing rollers on the two sides, capable of improving the material threshing rate and capable of reducing grain