Abstract: 【Purpose/significance】This paper tries to construct a personal information protection mechanism for public space data ap⁃ plicable in the era of artificial intelligence, aiming to cope with the problems of imperfect laws and regulations, insufficient technical means, and weak public awareness of privacy protection in the existing personal information protection.【Method/process】Combining the relevant theoretical methods of privacy protection, data security and technical ethics, this paper systematically analyzes the charac⁃ teristics, features and dimensions of personal information in public space data in the era of artificial intelligence, and proposes a spe⁃ cific and scientific protection mechanism.【Result/conclusion】Based on the current situation and challenges in the protection of per⁃ sonal information in public space data, this paper proposes a comprehensive protection mechanism framed by subject governance, on⁃ tology governance, environment governance and mechanism operation, and puts forward corresponding suggestions and countermea⁃ sures for the effective protection of personal information.【Innovation/limitation】The construction of personal information protection mechanism for public space data is a concrete practice of combining technology and ethics, and future research can be verified and im⁃ proved by combining data from specific fields.