For purpose of remediation of territories contaminated with anthropogenic natural radionuclides, at the first time was used high efficiency sorbent – lignin of timber, which is waste of pulp and paper industry. Obtained results indicated that lignin of timber is capable not only absorb effectively uranium and thorium from liquid phase of contaminated ashen-gray soil, but this absorption is competent. Obtained data demonstrated potential of lignin application for remediation of soils contaminated with radioactive elements.