The article examines the peculiarities of semantics and grammatical organization of phraseological units (further – PUs) with the nebo component. It is noted that both phraseological macro- and microsystems in Ukrainian linguistics began to be intensively studied only in the late XX-early XXI centuries. The purpose of the proposed intelligence is to investigate the place of the PU microsystem with the nebo component in the Ukrainian phraseology, to describe the semantics features, its grammatical organization representing this microsystem. The reference base was thesaurus and phraseological dictionaries of the Ukrainian language, internet sites, as well as the author’s own phraseological catalogue where 28 Pus are subject to analysis, the theoretical and methodological basis of research is the works of Ukrainian linguists, in which individual phraseological micro- and macro-systems are studied. The analysis of the PUs with nebo component gave grounds to summarize: 1. The microsystem of the PUs with the nebo component is relatively small, but rather diverse in its semantic features and grammatical organization; 2. for such PUs, as well as for the whole Ukrainian language in general, the phenomena of polysemy, synonymy and antonymy are characteristic phenomena; 3. the nebo component in such PUs is used in all case forms, with the exception of the vocative case. Most of the PUs of this microsystem is formed with the nebo component in the accusative singular case without a preposition (rarely): nebo prykhylyty with prepositions z: skynuty z neba na zemliu, padaty z neba, yak hrim z yasnoho neba, etc. (only 12 PUs); the least examples – in the dative singular and genitive plural: as hot as the heavens, to raise to the heavens (only 1 PU); 4. almost all syntactic structures in the microsystem of the PUs with the component nebo are presented here as well as for the whole Ukrainian phraseology in general: a) PUs related to the subordinate phrase: lizty do neba, distavaty zori z neba, etc.; b) PUs related to the word combinations: yak nebo vid zemli vyrosty, yak zirok na nebi, etc.; c) PUs as comparatives: khai kaminnia z neba padaie, etc., and two fold: dusha vidlitaie v nebo, as well as the subjunctive part of a compound sentence: de zemlia skhodytsia z nebom, etc.; 5. PUs with the component sky can appear in a sentence as a predicate (simple verb, compound noun, compound verb), circumstance; 6. semantic features and grammatical peculiarities of such PUs should be a subject to run a separate investigation in comparative aspect.