Marina Tsvetaeva wrote: «All my prose is autobiographical». The poet's notebooks are the most valuable material for confirming this phrase, because, in addition to the factual side of life, we can also trace the emotional side (through the graphic and stylistic features of the text to see an instant emotion). In the report, we answer the questions: What topics prevail in Tsvetaeva's notebooks? Can this autobiographical prose be considered absolutely reliable? Why does the definition of «the history of the soul» apply to Tsvetaeva's notebooks?