An integrated roller for a treadmill is comprised of rollers, the said rollers are of integrated structure with the outer end and the inner end integrated, the outer diameter surface of the said inner end and the inner hole surface of the said outer end form close fit or clearance fit, and the tip of the inner end extends inward along the inner diameter direction for a distance to form a plateau shape. The making method thereof comprises an extrusion and an inverted extrusion by a mold. This utility model features material saving, simple structure and less process steps in making and makes up the drawback of prior art rollers of high raw materials consumption, complicated structure and complicated making process. This invention is used for treadmill rollers.