Rolling smoothing device and production line

The utility model provides a rolling smoothing device and a production line, and the rolling smoothing device comprises a roller structure and a smoothing structure. The roller structure comprises a fixing piece and a roller, the fixing piece is inserted into the roller and is in running fit with the roller, and at least one end of the fixing piece protrudes out of the roller in the axial direction of the roller and forms a connecting part. The smoothing structure comprises a support and a smoothing piece, the support is connected with the connecting part, the smoothing piece is arranged around part of the roller structure and protrudes out of the support in the axial direction towards the side where the roller is located, the smoothing piece and the roller structure are distributed in a spaced mode and form a smoothing gap, and an inlet and an outlet which are communicated with the smoothing gap are formed in the two ends of the smoothing piece. The support and the smoothing piece are of an integrated struct