The invention discloses an alternated conveying device. A fixing frame, a positioning roller, a conveying roller, a distance adjusting mechanism, moving rollers, a first clamping and conveying belt, asecond clamping and conveying belt, a main conveying belt, a first flow guiding belt, a second flow guiding belt, a swinging mechanism and flow guiding rollers are included, and the positioning roller and the conveying roller are rotationally arranged on the fixing frame. The distance adjusting mechanism comprises a first drive assembly and a moving block, the drive assembly is arranged on the fixing frame, the moving block is movably connected with the fixing frame, and the moving block is in driving connection with the first drive assembly. At least two moving rollers are arranged and fixedly arranged on the moving block. At least two flow guiding rollers are arranged and include the first flow guiding roller and the second flow guiding roller, the second flow guiding belt is wound around the first flow guiding roller and the second flow guiding roller, the first flow guiding belt is matched with the main conveying belt, and the second flow guiding belt is matched with the main conveying belt. By means of the alternated conveying device, the capacity of a production line can be brought into full play, and the production efficiency is improved.