The roller conveyor is suitable for transporting various types of boxes, bags, pallets and other items. Bulk materials, small items or irregular items need to be placed on pallets or in turnover boxes for transportation. The accumulation and discharge roller can be used to realize the accumulation and transportation of materials. The roller conveyor has a simple structure, high reliability, and is easy to use and maintain. It has the characteristics of large conveying capacity, fast speed, brisk operation, and can realize collinear diversion conveying of multiple varieties.