Polyimide surface roughening process

The invention discloses a polyimide surface roughening process which comprises the following steps: contacting a polyimide workpiece with a pre-roughening solution I for pre-roughening, and then contacting the polyimide workpiece with a roughening solution II to obtain surface-roughened polyimide, the pre-roughening liquid is an aqueous solution containing NaOH, potassium permanganate and sodium dodecyl benzene sulfonate; the roughening liquid is an aqueous solution containing N, N-diethyl ethylenediamine and 1, 3-propane sultone. After two treatments of pre-coarsening and coarsening, a high-roughness coarsening layer is formed on the surface of the polyimide material, so that the surface tension of the polyimide material can be reduced, the hydrophilicity is improved, and good surface chemical activity is obtained. The surface activity of the material is improved, and chemical bonds with strong binding force and high stability are formed, so that active sites are provided for active particle attachment and m