The joint cracking of mechanically activated oil shale and petroleum residue. The introduction of oil shale allowed to intensify the process of destruction of high-molecular components of the petroleum residue. In the obtained liquid thermolysis products, oils predominate from 40,2 to 81,1% wt. With an increase in the share of oil shale in the cracking products, the proportion of asphaltenes decreases from 4.2 to 2.8% by weight, and of tar from 6.7 to 4.8% by weight. and aromatic hydrocarbons. In gaseous products, the proportion of carbon dioxide and carbon monoxide increases markedly. The introduction of mechanically activated oil shale also affects the fractional composition of thermolysis products; the proportion of gasoline (IPB - 200° C) and diesel fractions (200 - 360° C) changes.