The article reveals the types of stylistic errors made when translating a literary fairy tale from Russian into the Yakut language; examples are given from the translated text made by the Yakut translator V. S. Fedorov – Sameer Basylai in 1983. As the source text for the comparison, we used Russian translations made by the Hansen spouses of the fairy-tales by famous Danish writer Hans Christian Andersen: “Wild Swans”, “Flint”, “Steady Tin Soldier”, “Piggy Bank”, “Ugly Duckling”, “Snow Queen”, “Nightingale”, “Shepherd Girl and Chimney Sweep”, “Old House”, “Magic Hill”, “Flying Chest”, and “Thumbelina”. A comparative and descriptive method was used with the use of the classification of stylistic errors made in the Yakut translation. The methodological basis of this study was the work of Russian researchers I. B. Golub and G. Y. Solganika in the field of stylistics and culture of speech of the Russian language, as well as educational publications in the Yakut language by T. I. Petrova, A. A. Vasilyeva, and N. A. Efremova. The authors gave an objective assessment of the quality of the translation of the text in the Yakut language, based on the analysis, the following types of stylistic errors in the translated text were identified: 1) at the lexical level (confusion in the meaning of the word, redundancy, insufficiency of the word, violation of the usual and literary norms, distortion of phraseological units, interspersed with clericalisms); 2) at the grammatical level (adding inappropriate affixes); 3) at the syntactic level (violation of the order of words in a sentence).