NOVELTY - A device comprises feeding tube, crusher (2), fermentation pond (3), filtering device, water content measuring instrument (4), and pelletizing machine (1). The feed inlet of the crusher is used for receiving straws. The discharging port of the crusher is connected with feed inlet of the fermentation pool. The filtering device is used for filtering straw powder after fermentation in the fermentation tank and producing biogas residue. The water content measuring instrument is used for determining water content of biogas residue rate.    USE - Device used for pressing biomass particles (claimed).    ADVANTAGE - The device solves farmers' difficult effective utilization of massive straws and biomass residues problem.    DETAILED DESCRIPTION - A device comprises feeding tube, crusher (2), fermentation pond (3), filtering device, water content measuring instrument (4), and pelletizing machine (1). The feed inlet of the crusher is used for receiving straws. The discharging port of the crusher is connected with feed inlet of the fermentation pool. The filtering device is used for filtering straw powder after fermentation in the fermentation tank and producing biogas residue. The water content measuring instrument is used for determining water content of biogas residue rate. The pelletizing machine is used for accommodating biogas residue and straw mixture or powder. An INDEPENDENT CLAIM is included for pressing method of biomass particles comprising conveying straws to crusher by conveying pipe; crushing straws into straw powder and conveying into fermentation tank; fermenting straw powder to generate methane and filtering fermented straw powder to generate biogas residues; detecting moisture content of biogas residues and adding straw powder into biogas residues if moisture content is higher than set threshold value and until moisture content is lower or equal to the set threshold value; and conveying biogas residues to pelletizing machine and pressing biogas residues into straw particles.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of device.    Pelletizing machine (1)    Crusher (2)    Fermentation pond (3)    Water content measuring instrument (4)