The objective of the paper was to determine usefulness of a new, prototype pelletizing and briquetting device for the process of briquetting waste vegetal material. During research the impact of potato pulp content (15, 20 and 25%) in the mixture with buckwheat husk and the mass intensity of raw material flow (100, 150 and 200 kg·h -1) on the demand of a device for power and kinetic strength of the obtained briquette were determined. Tests on briquetting were carried out with the use of a flat briquetting matrix with a diameter of meshes of 28 mm and the length of 80 mm cooperating with the system of three densifying rolls, which move with the speed of 120 rot·min -1 and with the fissure between the rolls and the matrix equal to 0.4 mm. The quality of briquettes was assessed with the use of a rotating tester according to recommendations of standards GOST-18691-73 and ASAE S.269-1A. Based on the research which was carried out, a significant impact of the mass intensity of raw material flow and the percentage share of potato pulp in the compacted mixture for the power demand and kinetic strength of the obtained briquette was found.