SUMMARY
The article analyzes the source-base history of domestic children's movement. Summarizing the different scientific approaches, the author singles out the main sources of problems in the history of children's movement: real sources; filmphotophonodocuments, visual materials, written sources. Particular attention is devoted to the analysis of written sources (documents of parties, youth and children's organizations, published an appeal letters about the Young Pioneers party, government and public figures, statistical sources; materials periodicals, documents of educational, scientific and educational institutions and authorities of public education, memoirs, materials of the international children's movement).