The invention relates to the agricultural industry, specifically to the processing of organic waste materials (livestock and poultry farming waste, domestic and industrial waste water, straw, peat and other organic substances) to produce organomineral fertilizers in granulated form. The method for producing a granulated organomineral fertilizer from organic waste materials comprises feeding the mixture components, removing mechanical impurities, mixing with the addition of mineral components, grinding, decontaminating, homogenizing, granulating and drying. The grinding, decontamination, homogenization and granulation processes are performed simultaneously on continuously operating heated rollers with the mass to be processed being passed through shaping rings of the rollers and with cutting to form granules. The granules are dried to a set moisture content in a continuously operating heated vacuum dryer operating in pulsed vacuum modes. The device for producing a granulated organomineral fertilizer from org