Steel polishing machine

The utility model relates to the technical field of steel polishing, and discloses a steel polishing machine which comprises a box body, a lifting assembly is arranged in the box body, the lifting assembly comprises a rack arranged in the box body, a plurality of hydraulic rods are arranged on the rack, an upper polishing assembly is arranged on the inner side of the rack, and a lower polishing assembly is arranged on the inner side of the upper polishing assembly. The upper grinding assembly comprises a first grinding main roller arranged on the inner side of the rack, a plurality of hollow guide rollers are arranged on the outer side of the first grinding main roller on the rack, a lower grinding assembly is arranged on the lower side of the first grinding main roller in the box body, and the lower grinding assembly comprises a second grinding main roller rotationally arranged in the box body; a conveying roller set is arranged on the outer side of the second grinding main roller on the box body, and one en