The article is devoted to the study of parliamentary sovereignty in British constitutional law and its relationship with the principle of the rule of law. The assigned tasks were achieved through the use of dialectical, systemic, formal legal, and empirical methods. As a result of the study, the author conducted a comprehensive analysis of parliamentary sovereignty from the point of view of its theoretical foundations and implementation in UK law enforcement practice. The article concludes that parliamentary sovereignty is a model of the organization of state power in which parliament is given a central place, its acts are generally binding for everyone without exception and can be canceled, changed or suspended only by parliament itself. At the same time, as the analysis shows, at the present stage the principle of the rule of law is capable of influencing the implementation of the political will of parliament and, as a consequence, parliamentary sovereignty.