<p>The aim of the work is to develop composite compositions for the comprehensive restoration of oil-contaminated soils and to increase their fertility. The main research methods are IR spectroscopy, laboratory analyses using modern equipment, and the Fisson E. A 1.04 Carbograph autoanalyzer. The scientific novelty of this research lies in a comprehensive approach to the reclamation of oil-contaminated soils using composite compositions containing biologically active water-soluble polymers and hydrogels, Kazuglegumus biofertilizer, and multicomponent aluminum alloys in the biochar composition. Hydrogel significantly accelerates oil biodegradation by increasing the availability of moisture and oxygen for oil-degrading microorganisms. The plant-based sorbent biochar, thanks to its high specific surface area, effectively binds petroleum products, improves aeration, water retention capacity, and nutritional composition, increasing soil fertility. Organo-mineral fertilizer (potassium humate) activates soil microflora, stimulates the development of hydrocarbon-oxidizing bacteria, and accelerates the microbial degradation of petroleum products. The research was conducted on soils in the village of Kainar, Almaty region, which do not contain oil, and on soils in the evaporation pond of AOR LLP, which contain oil in concentrations ranging from 0.05% to 5.31%. Studies to determine the effectiveness of restoring oil-contaminated soil samples from the evaporation pond were carried out in laboratory and field conditions. Analysis of oil-contaminated soil samples taken from the bottom and shoreline of the evaporation pond was carried out before and after treating the soil with composite compounds. It was established that the new composite compositions are an effective solution for detoxifying oil-contaminated soil, as well as restoring and increasing its fertility. The oil content in the soil before treatment ranged from 5.01 to 20%, and after treatment reached 0.2 to 2.41%. It was found that hydrogel in combination with biochar activates the germination of seeds of perennial leguminous plants, as well as the growth and development of their above-ground and root systems. The effectiveness of soil reclamation is explained by the reduction of oil concentration to acceptable limits, as well as the transformation of natural humic substances and the additional potassium humate added to the composition with biochar, which increases the biological activity of soils and the resistance of biological objects to nonspecific stress factors.</p>