The cold rolling mill is a machine that cold-rolls and cold-rolls a Class I hot-rolled Q235 round bar into a helical steel bar. The cold rolling mill equipment can carry out cold processing on the latitude and longitude direction of the base metal while rolling the cold-rolled ribbed steel bar. Under the premise of maintaining the relative balance and stability of the original central section, the anti-pressure and anti-pressure are improved. At the same time, it still retains enough elongation properties, which makes the geometric parameters (rolling thickness, aspect ratio, face shrinkage and pitch) and four material indexes (tensile strength, conditional yield value) of cold-rolled ribbed steel bars. , Elongation and cold bending) can be used for important industrial and civil buildings at a safety level, saving steel consumption and reducing construction prices.