NOVELTY - A pyrohydrolysis fermentation device comprises a preheating unit for preheating an organic biomass raw material from outside by flashing vapor from rotary pyrohydrolysis unit. The rotary pyrohydrolysis unit employs rotation mode to mix high-pressure vapor from outside with preheated organic biomass raw material from preheating unit and then performs pyrohydrolysis and flashing evaporation in series. A mixed fermentation unit is used for mixing the flashed organic biomass with digestive liquid and then cooling and digesting in series to obtain biogas and biological residue.    USE - Device for pyrohydrolysis fermentation treatment by rotation mode (claimed), particularly for organic biomass treatment.    ADVANTAGE - The device has high heat exchange efficiency and short pyrohydrolysis period with energy saving and consumption reduction.    DETAILED DESCRIPTION - A pyrohydrolysis fermentation device comprises a preheating unit for preheating an organic biomass raw material from outside by flashing vapor from rotary pyrohydrolysis unit. The rotary pyrohydrolysis unit employs rotation mode to mix high-pressure vapor from outside with preheated organic biomass raw material from preheating unit and then performs pyrohydrolysis and flashing evaporation in series. A mixed fermentation unit is used for mixing the flashed organic biomass with digestive liquid and then cooling and digesting in series to obtain biogas and biological residue. The rotary pyrohydrolysis unit comprises one or more rotary pyrohydrolysis reactors for exchanging heat between high-pressure vapor from the outside with the organic biomass raw material from preheating unit by rotation mode and then performing the pyrohydrolysis. One or more flashing kettles are connected in series and used for flashing the organic biomass obtained by pyrohydrolysis. A material inlet of each rotary pyrohydrolysis reactor is connected to a material outlet of preheating unit through a pipe. A high-pressure vapor inlet of each rotary pyrohydrolysis reactor is connected to the outside through the pipe. Each rotary pyrohydrolysis reactor comprises a pressure-relieved vapor inlet and a pressure-relieved vapor outlet. The pressure-relieved vapor inlet of each rotary pyrohydrolysis reactor is connected with pressure-relieved vapor outlets of other rotary pyrohydrolysis reactors through the pipe. The pressure-relieved vapor outlet of each pyrohydrolysis reactor is connected with the pressure-relieved vapor inlets of other rotary pyrohydrolysis reactors through the pipe. The material inlet of reach rotary pyrohydrolysis reactor is connected to the material inlet of a first flashing kettle in series through the pipe. In the flashing kettles connected in series, the material outlet of a previous flashing kettle is connected with the material inlet of a next flashing kettle; and the material outlet of the last flashing kettle is connected to the material inlet of the mixed fermentation unit. A flashing vapor outlet of each flashing kettle is connected to a flashing vapor inlet of the preheating unit through the pipe. An INDEPENDENT CLAIM is included for method for realizing pyrohydrolysis fermentation treatment by rotation mode.    DESCRIPTION OF DRAWING(S) - The drawing is a block diagram of a method for realizing pyrohydrolysis fermentation treatment (Drawing includes non-English language text).