To make full use of previous experience and effectively improve the speed of steel product packaging process planning, a retrieval methodology of steel product packaging process based on case-based reasoning was proposed. Based on the case library, a two-stage retrieval method proposed. In the first stage, the set of the packaging process instances in the same packaging code were retrieved through encoding products. In the second stage, the most similar case was retrieved by calculating the similarity of steel product packaging parts type, material characteristics and geometric dimensions, and gradually filtering out unqualified cases. The effectiveness of this methodology was verified with real cases.