The right to the protection of personal data is an im-portant human right in the era of big data and a constitutional right based on the national protection obligation and the theory of human dignity, making it of special significance for the realization of citi-zenship in a digital society. It can be seen from an examination of the constitutional texts of various countries in the world that the right to the protection of personal data as a constitutional right has rich nor-mative connotations, and the key legal link to realize this right lies in the national legislature actively fulfilling its obligation to shape and specify the protection of personal data in accordance with the entrust-ment of the constitutional norms. Given the constitutional principles of fundamental rights protection, i.e., realizing the constitutional sta-tus of the right to the protection of personal data as a basic right by means of institutional guarantees, the legislature should first adhere to the constitutionality principle of data protection legislation. Second, a multi-level data protection legal system centered on the right to the protection of personal data should be established. Finally, the institu-tional guarantee mechanism for the protection of personal data should be continuously improved through constitutional interpretation.