The invention relates to the field of fuel production, chemical engineering and waste management, and deals with the method of co-pyrolysis of plastic waste, whereby plastic waste is co-pyrolyzed with inorganic material to increase the quality of oil, and the proportion of plastic waste accounts for up to 85% of the pyrolysis mixture. As a result of co-pyrolysis, gas, oil and solid residue are produced in different proportions. The purpose of the invention is to solve the problem of the quality of oil produced by the pyrolysis of plastic waste in order to prevent the re-condensation of the oil components and the formation of solid particulates in the oil. As an inorganic material, the co-pyrolysis process uses carbonate rock as a result of the extraction of oil shale, silicate sand, and inorganic residues (ashes) from oil shale industry. The co-pyrolysis of plastic waste can be directly applied to a small-scale production plant as batch process with simple structure of pyrolysis equipment consisting from a pyrolysis reactor, condensation system for a steam-gas mixture and a gas utilization unit.
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