NOVELTY - The method comprises liquefying biomass and plastics, drying the biomass and plastics at 150-200 degrees C, dispersing biomass and plastics at 300-400 degrees C in the presence of recycled carrier oil, bringing the obtained mixture to reaction at 300-400 degrees C, separating the arising gaseous, liquid and solid products from each other and optionally further processing the products, hydrogenating the uncured liquid products, and subjecting the resulting solid products to a steam-reforming or gasification reaction, where the ratio of biomass to plastic is 80:20 to 10:90 wt.%.    USE - The method is useful for producing fuel from solid biomass mixture comprising renewable biomass and/or carbohydrates and plastic mixture consisting of polyethylene, polypropylene and/or polystyrene (claimed).    ADVANTAGE - The method is capable of continuously, simply, economically, safely, rapidly and efficiently producing the fuel from the solid biomass and plastics with high purity and reduced energy consumption.    DETAILED DESCRIPTION - The method comprises liquefying biomass and plastics, drying the biomass and plastics at 150-200 degrees C, dispersing biomass and plastics at 300-400 degrees C in the presence of recycled carrier oil, bringing the obtained mixture to reaction at 300-400 degrees C, separating the arising gaseous, liquid and solid products from each other and optionally further processing the products, hydrogenating the uncured liquid products, and subjecting the resulting solid products to a steam-reforming or gasification reaction, where the ratio of biomass to plastic is 80:20 to 10:90 wt.%. The method is conducted without externally supplying carrier oil and catalyst, where pressure in the liquid phase is guided and/or the formed carrier oil is partially or completely recycled during dispersing the biomass and plastics. A part of the liquid phase is removed from a reactor (R1, R2, R3), hydrogenated and subsequently recycled in the reactor. The formed gaseous products are fed into a gas motor or a gas turbine and/or the formed liquid oily products are subjected to rectification and hydrogenation and/or the formed solid products, after drying if necessary, are subjected to a steam reforming or gasification process and/or the resulting aqueous phase is processed to produce biogas during the separation of the gaseous, liquid and solid products. The biomass and plastics have residual moisture of less than 35% and/or a particle size of less than 10 mm. An INDEPENDENT CLAIM is included for a system for producing fuels from biomass and plastics.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a system for producing fuels from solid biomass and plastics.    Condensers (K1, K2, K3)    Phase separator (PT)    Reactor (R1, R2, R3)    Rectification column (RKT)    Separators. (S1, S2)