Analysis of temperature impact in the compression chamber on density and mechanical endurance of briquettes produced of the selected plant raw materials was presented. Wheat, maize, rapeseed straw and meadow hay were used for production of briquettes. The researched raw materials were ground with the use of a drum straw-cutter driven with an electric motor of 7.5 kW capacity. Theoretical length of cutting raw materials was 20 mm. Analysis of moisture of raw materials and density and mechanical strength of pellets was carried out according to valid standards. Moisture of the researched raw materials was within 13-15%. A screw briquetting machine JW-08 with a heated compression chamber with an electric heater of 3 kW power. Density and mechanical strength of briquettes depended on the type of the used raw material and temperature in the compression chamber of a briquetting machine. The lowest density of briquettes was within 505 to 734 kg.m -3 for rye straw and the highest within 643 to 827 kg.m -3 for maize straw at the temperature in the compression chamber respectively 200 and 250ºC. Whereas, mechanical endurance of briquettes for the accepted temperatures in the compression chamber was within 52 to 74% for rape straw and within 69 to 94% for maize straw.