The invention relates to a method for preparing aromatic diacid chloride, specifically, in a pressure reactor, using thionyl chloride, phthalic acid, isophthalic acid, terephthalic acid and other aromatic diacids as raw materials, pyrrole Alkanes, piperidines, pyridines, quinolines, isoquinolines, o-phenanthrolines, imidazoles, benzimidazoles and other nitrogen-containing organic bases or their derivatives are used as catalysts, reacted at 90-135°C for 1-3 hours, and the pressure of the reaction system is controlled Between 0.2 and 4Mpa, distill or vacuum distillation to recover thionyl chloride and catalyst, and the molar yield of phthaloyl dichloride, isophthaloyl dichloride, terephthaloyl dichloride and other aromatic diacid chlorides is up to 99%. , with a purity of over 99%. The invention has the advantages of short reaction time, high product yield, simple and convenient reaction operation and the like.