The invention provides a constant-distance synchronous conveying device. The constant-distance synchronous conveying device is provided with a transmission assembly, a pressing assembly and an elasticassembly, wherein the transmission assembly is provided with a guiding strip and a guiding plate right opposite to the guiding strip; the pressing assembly abuts against the inner side face of the guiding strip and is provided with the positioning plate and a plurality of pressing units arranged on one side face of the positioning plate, and each pressing unit is provided with a positioning piecepivoted to the side face of the positioning plate and a pressing wheel which is pivoted to the positioning piece and abuts against the inner side face of the guiding strip; and the elastic assembly drives the positioning pieces to rotate so as to make the pressing wheels to move towards the guiding plate. Each pressing wheel has a moving stroke and moves along the moving path of a rod-shaped partin the moving stroke. Therefore, through the constant-distance synchronous conveying device, it can be ensured that the rod-shaped part is continuously pressed by the pressing units in the conveyingprocess.