Fixed word combinations occupy an important place in the vocabulary of our language. Fixed expressions formed in the language as a result of metaphor are called phraseologisms. Phraseologisms exist in our language in the form of word combinations and sentences. Folk beliefs are included in many phraseology of the Azerbaijani language. The people of Azerbaijan considered water, wood, fire, sun, moon, sky, mountain and many beings as sacred, and many beliefs related to them appeared. These beliefs are reflected in the ancient oral folk literature samples and in the formed word combinations. Water, trees, mountains and etc. are among the cults of the Turkic people. We find a lot of phraseological combinations related to these words in our language. If we consider the essence of these phraseological combinations, we can see their connection with folk beliefs. In the research, the sub-layers of phraseologisms are investigated, their connection with beliefs is revealed. During the research, the beliefs of both Turkish peoples and other peoples are looked at, and phraseologisms are analyzed on a general level. The article analyzes the beliefs associated with phraseologisms. In phraseologisms, beliefs that are not on the face, hidden in the substratum, rooted in their essence are also revealed.