The article presents the results of a study on the development of the petrochemical industry, which is part of the structure of the fuel and energy complex of Kazakhstan. The development of the petrochemical industry of the country is carried out through the creation of a petrochemical cluster and the construction of plants for the production of petrochemical products (polyethylene, butadiene, polypropylene, polyethylene terephthalate), which are geographically located in the western region of the country, where the main hydrocarbon reserves are concentrated, large oil and gas production enterprises operate, there are necessary infrastructure facilities. Forecast indicators of the development of petrochemistry, technical and economic characteristics of petrochemical projects are given. Information is presented on the development of the petrochemical cluster and the organization of the production of each petrochemical product separately. The authors carried out forecast calculations for import substitution and export in the implementation of petrochemical development projects in Kazakhstan. The purpose of the article is to conduct a predictive analysis of the development of the petrochemical industry in Kazakhstan, since this branch of the national economy is still at the stage of formation.