The constitutional and legal mechanisms of regulation of economic social relations in the Polish state in the 20-30s of the twentieth century are investigated. It is determined that the fundamental constitutional and legal institutions of the economic system are property, labor, and the financial system. Constitutional regulation of the sphere of economic organization of social life of different states is not the same in form and volume. Based on the analyzed broad legislative framework, it is stated that in the first half of the 20s of the twentieth century. political, economic and legislative formation of the Polish state took place. Reforming the financial system, agriculture, trade contributed to the formation of the Polish economic system. It is noted that the intervention of state bodies in economic affairs was minimal, which contributed to the development of various industries of the country and the economy as a whole. In the period from the May 1926 coup to the beginning of the world economic crisis, Polish legislation began to change from free democratic to authoritarian. The situation was characterized by contradictory trends: on the one hand, democratic institutions and the Constitution of 1921 remained, on the other hand, the executive branch demonstrated the desire to govern the state, despite the parliament and political parties. The new legislation introduced by the Pilsudchiks in the first half of the 30s, on the one hand, was aimed at overcoming the crisis in the economy, and on the other hand, it was marked by increased interference of power in all spheres of society. It is stated that in the interwar period, the Second Polish Republic quickly created and developed its own economy. This was achieved thanks to the well- established system of economic social relations of the Polish state - the system of relations of property, production, exchange, distribution and consumption of material and spiritual goods. The leading role in this was played by the liberal, democratic constitutional and legal field, which became an effective mechanism for regulating the economic activity of the state. shows effective ways, forms and methods. It is recommended to use the experience of developing the legislation of the Polish state to improve modern Ukrainian economic law.