At the present stage of human development, numerous regulations are consolidated and, accordingly, a list of initial principles on which international relations between states are based is defined. The issue of their study and interpretation is extremely relevant today, since every day around the world these principles are violated by the emergence of armed conflicts, the implementation of terrorist acts, as well as military actions between different countries. Of importance among them is the principle of sovereign equality, since it is a solid basis for equality and mutual respect between states and is increasingly becoming the object of arbitrary violation, which requires an in-depth study of this principle and determine its place among other generally established principles of international law. The purpose of this study is to consider the history of the development of sovereign equality, investigate its structure and constituent elements, and most importantly, establish an interrelation with other principles of international law. This paper uses several scientific research methods that allow for an in-depth examination of this subject area, including the method of analysis, the method of synthesis, the method of comparative analysis, the method of deduction, the method of abstraction, the method of generalisation, as well as the method of analysis of scientific literature. The results obtained after the study are theoretical and practical principles for the implementation of sovereign equality by states around the world, determining its role in building international relations, as well as its correlation with other principles developed in international law. The practical value of this study is its use in the development of methodological materials for teaching such an academic discipline as international law, as well as for extracurricular familiarisation of students with this subject. Furthermore, the results and conclusions formed in this study can be used by other researchers to investigate the implementation of the fundamental principles of international law, including the principle of sovereign equality.