The article analyzes the economic history of the USSR, covering an important period of the history of Stalin’s economic model – the initial period of the Great Patriotic War (1941–1942). The main feature of the Soviet economy during the war was that already in the first months the USSR lost control over the most developed industrial areas. This situation required fundamental reorganization of the structure of the economy, when its main production capabilities were used to produce military equipment at the expense of reducing the output of civilian products. The losses of the USSR economy from the occupation of part of the territory are considered and it is shown that the USSR in 1941–1942 fought Germany and its allies, having halved mobilization and economic potential. The article analyzes the process of transferring the economy to the war economy, which required an increase in the length of the working day and the abolition of vacations, the introduction of the card system, and the relocation of plants to other territories. The structure of state administration bodies, changes in the organization of management and the position of its individual participants in it are studied separately. Tables are given and analyzed, giving an idea of the volume and dynamics of production of means of production in this period, the production of non-ferrous metals, the production of consumer goods, military equipment. It is shown that due to the low quality of military production in the Red Army a huge proportion of non-combat losses, which was primarily due to unrealistic plans. The situation in agriculture is examined, where the decline in productivity was due to a number of reasons, including the predominant mobilization of the population from rural areas with a minimum of reservations, the almost complete cessation of supplies of mineral fertilizers and agricultural machinery and, consequently, a sharp decline in the mechanization of work. The situation in the construction industry, in the work of railroad transport is studied. The calculation of the dynamics of national income for 1940–1942 years is given. Thus, in the initial period of the Great Patriotic War revealed the strengths of the Stalinist economic model and created in the 30-ies military-economic potential, high qualifications of the country’s leaders promoted in the last pre-war years. The greatest achievements of the Soviet economy in this period are associated with the record-breaking rapid transfer of the entire economy on military rails.