The aim of this work was an analysis of coefficients of quality of work of selected groups of agricultural machines, which are used in vegetable production. On the basis of inquiry held among immediate users of these machines from Wielkopolska region was made the systematization. The analysis of the results of the inquiry will allow to estimate the knowledge of the farmers in this field as well it will verify legitimacy of usage of parameters describing the quality of work of agricultural machines and tools, which are contained in Polish Norms. Agricultural machines, which are the most often used in agriculture are the object of the researches, and namely: cereal sowing-machines, planters to potatoes, combine cereal harvesters and combine harvesters to gathering potatoes.