The scientific article examines the importance of the principle of the rule of law in the system of constitutional principles for the implementation of the right to a safe environment. It was found that constitutional principles are a type of legal principles and there is also no unity among scientists to understand them, which cannot contribute to the unequivocal application of law. The innovative approach and proposed concepts of «ecological constitutionalism» are analyzed, which at the same time shows the complexity of the issue of environmental protection, the combination of the principles of constitutional, environmental and international law. It further developed the proposition that every modern constitution should be based on a fundamental environmental commitment to present and future generations and thereby protect key societal values from certain political turbulence, government policy change that favors short-term economic or political advantages over long-term environmental or economic sustainability. It is the constitutional norms that must guarantee the sustainability of development, as well as stability from political changes in the course regarding the protection of basic human rights and the protection of a safe environment, without which it is not possible to create the proper conditions for a decent human life and social development. The concepts of «constitutional principles», «principles of environmental law» and «rule of law» were studied. Various approaches among scientists to understanding the principle of the rule of law have been clarified. Those decisions of the Constitutional Court of Ukraine that allow personifying and objectifying the principle of the rule of law, as well as developing the content of this principle, are analyzed. It was established that the Constitutional Court of Ukraine in its decisions meaningfully filled the principle of the rule of law, emphasized the non-identity of law and law, remarked on justice as a key element of law, which in combination with equality, legal certainty fills this concept. Our own approach to understanding the principle of the rule of law as the basis of the system of constitutional foundations for the realization of the right to a safe environment is substantiated.