This article examines the life and scientific heritage of the great scientist, mystic theorist, muhaddit, ascetic Abu al-Bakr Kalabadi. In particular, he was not only a representative of religion or a mystical sheikh, but also a scientist, theorist-mystic, the founder of the Bukhara school of mysticism, well versed in religious secular sciences. His famous works At-Taarruf and Bahrul-favoid are recognized as the greatest and most perfect works of their time. There is information that his manuscripts are stored at the Institute of Oriental Studies named after Abu Raikhan Beruni.