Mould part processing method

The invention relates to a mold part treatment method, which relates to the technical field of surface treatment, and comprises the following steps: controlling a first polishing piece to polish preset first polishing areas on two sliding blocks respectively or simultaneously, the first polishing piece comprising a graphite structure; the two sliding block sets are controlled to be assembled into an integrated sliding block set; a second polishing piece is controlled to conduct polishing operation in a preset second polishing area at the junction of the two sliding blocks so as to eliminate the offset of the two sliding blocks in the preset second polishing area, and the second polishing piece comprises a graphite structure; and mirror grinding is conducted on the two sliding blocks so as to remove machining lines, left on the two sliding blocks, of the first polishing piece and/or the second polishing piece. In the two polishing steps, a tool comprises a graphite structure, the graphite structure has the cha