Production method and production line for bearing part of sliding rail

The invention discloses a production method of a bearing part for a sliding rail, which comprises the following steps: folding a steel belt in an axial symmetry manner, so that the middle part of the steel belt forms a bent part, the side parts positioned on the two sides of the middle part form first parts which are attached to each other, and the two ends of the steel belt extend in the directions away from each other; the end, away from the first part, of the bent part forms an arc section, and the bending angle alpha of the arc section is larger than or equal to 210 degrees and smaller than or equal to 300 degrees. The attached first parts are welded and connected; cutting is conducted between the welded first part and the bent part, the bent part is separated from the first part and the bent part, and a bearing piece is formed; the invention further discloses a production line adopting the production method. According to the production method and the production line, continuous machining of the bearing p