Passive cold mill

The utility model relates to a passive cold mill for milling the rib reinforcing bar, which is characterized in that the wall at one side of the roller frame, the roller shaft and the convex wall at one end of the shaft sleeve are opened with corresponding pin holes and fixed together through a pin rod; moreover, the roller and the roller shaft sleeve is opened with corresponding key ways and are fixed together through the key ways. The utility model has such advantages as reasonable design, simple structure, convenient regulation and long service life as well as being firm and accurate and improving the wire quality.