The invention relates to an exchange device used for dual-linear belt conveying. The exchange device comprises a bottom board. A vertical frame is welded to the left side of the bottom board. A top board is fixedly connected to the upper end of the vertical frame. A lifting device is installed on the right portion of the lower end of the top board. A lifting rod is connected to the lower end of the lifting device. A transverse plate is fixedly connected to the lower end of the lifting rod. Pads are arranged on the left side and the right side of the transverse plate. A stand column frame is installed on the right side of the bottom board. An outer gear ring is rotatably connected to the upper end of the stand column frame. Twisting boards matched with the transverse board are installed at the left end and the right end of the inner side of the outer gear ring. A drive device matched with the outer gear ring and the lifting device is installed on the left portion of the lower end of the top board. The exchange device is high in degree of automation, the two twisting boards can push the transverse board to rotate by 180 degrees in a wheel-gear engaged drive mode while every two different products are controlled to rise and fall automatically, and therefore the function that two batches of different products are exchanged in position one by one can be achieved, and control is convenient.