▎ 摘　　要

NOVELTY - Preparing metal-free catalyst comprises mixing the carbon source and nitrogen source and ball milling to obtain the catalyst precursor, roasting the obtained catalyst precursor, cooling to obtain the non-metal catalyst, the mass ratio of the carbon source to the nitrogen source is 1-10: 1. USE - The metal-free catalyst is useful in the catalytic acetylene hydrochlorination reaction (claimed). ADVANTAGE - The method is simple, economical and has high catalytic activity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for metal-free catalyst obtained by above method.