Method for pretreating metallic luster surface of automobile ornament

The invention relates to the technical field of automobile ornament manufacturing, and discloses an automobile ornament metallic luster surface pretreatment method which comprises the following steps: step 1, workpiece cleaning: hanging a workpiece, washing with water, removing acidic substances, and washing with water again; step 2, roughening the workpiece: pre-roughening to form a chromium layer, washing with water, performing hydrophilic formal roughening, and washing with water again; 3, workpiece oil removal, wherein the workpiece is reduced, washed with water and then subjected to preimpregnation treatment; 4, activating the workpiece palladium: washing the activated workpiece palladium with water, and washing again after peptization is completed; fifthly, chemical nickel treatment is conducted on the workpiece, and after a nickel layer is formed, a trivalent chromium plating solution is prepared for electroplating; and sixthly, workpiece aftertreatment is conducted, specifically, the workpiece is drie