The utility model discloses a cold rolling machine which comprises a rolling roller set, a transport unit, an anti-winding guide plate and an injection beam, wherein the injection beam is arranged on two sides of the rolling roller set. The cold rolling machine further comprises a liquor supply pipeline, a plurality of nozzles and an injection beam arm, wherein the liquor supply pipeline is used for transporting processing liquor, and the nozzles are used for injecting the processing liquor. The injection beam arm is connected with the liquor supply pipeline, and the plurality of the nozzles, and fixes the nozzles. The plurality of the nozzles are perpendicularly connected with the injection beam arm, and a fixed included angle is formed between the plurality of the nozzles and the horizontal plane. The processing liquor flowing back along a conveyor belt is blocked by the processing liquor sprayed through the plurality of the nozzles on the injection beam, and the included angle between the plurality of the nozzles and the horizontal plane and the injection speed of the processing liquor are decided according to the backflow quantity of the processing liquor. The cold rolling machine not only can not affect quality of metal finish products, but also greatly reduces resource waste on the premise of effectively preventing the processing liquor from flowing back.