The article reveals previously unknown facts about the sinologist Sergei Alexandrovich Polevoy (1886—1971), who became famous due to his scientific, pedagogical and social activities in China. Being a native of dynasty that gave the world talented literary critics, writers and journalists, Polevoy from his youth was passionate about literature and collecting books alongside learning about China. His first academic work, prepared as a graduation paper at the Oriental Institute (Vladivostok), was devoted to periodicals in China; and his unique library composed of literature in many languages originated from the books on Oriental studies and linguistics. Living in China since 1917, Polevoy was a professor at Nankai University in Tianjin (since 1918) and then Peking University (since 1921), where he taught Chinese students the Russian language and literature. Using the introduction to Russian culture and literature as a new method of teaching, he brought up some famous Chinese writers and translators. His bookstore, opened in Beijing and having contacts with the International Book Company in Moscow, became a cultural bridge between Russia and China. Using the bookstore, Polevoy supplied Chinese students with textbooks and Russian classical literature, replenished the department of Slavic literature at the Beijing National Library, distributed Marxist literature and helped Chinese communist leaders establish contacts with the USSR. The authors also report the facts on the biography of Polevoyʼs son, Leonid, thanks to whom the Oriental Institute of the Far Eastern Federal University (Vladivostok) received the manuscript of S. Polevoy’s English-Chinese dictionary and his other materials on oriental studies. Leonid also presented his father’s book collection to Irkutsk, and these books served as the basis of the Humanitarian Centre — Library named after the Polevoys’ family. The article is based on materials from the Polevoys’ family archives and other private collections abroad.