NOVELTY - A one-step anaerobic dry fermentation device, comprises a feed door, at least two stirring motors (2) with driving sprockets (3), and a vertical helix reducing motor (5) connected with vertical helix conveyer (7), which are installed at the top of the tank; where a material pipe (6) is sleeved outside the vertical helix conveyer (7); an upper guide plate (8) is installed on upper part of the material pipe (6); a lower guide plate (10) is installed on lower part; and at least two rings of inner ring pipes (17) are installed between the upper guide plate (8) and lower guide plate (10).    USE - The one-step anaerobic dry fermentation device is useful for garbage processing in plant.    ADVANTAGE - The one-step anaerobic dry fermentation device has simple structure, fast fermentation speed, and high fermentation efficiency.    DETAILED DESCRIPTION - A one-step anaerobic dry fermentation device, comprises a feed door, at least two stirring motors (2) with driving sprockets (3), and a vertical helix reducing motor (5) connected with vertical helix conveyer (7), which are installed at the top of the tank; where a material pipe (6) is sleeved outside the vertical helix conveyer (7); an upper guide plate (8) is installed on upper part of the material pipe (6); a lower guide plate (10) is installed on lower part; at least two rings of inner ring pipes (17) are installed between the upper guide plate (8) and lower guide plate (10); at least two ring-pipe brackets (13) whose number is the same as that of the inner ring pipe (17) are installed on inner wall of the tank (1); an outer ring pipe (18) connected with the inner ring pipe (17) by a radiation pipe (16) is installed on the ring-pipe bracket; a gas spraying hole is processed on the outer ring pipe (17) and inner ring pipe (18); a discharge helix conveyer (9) and a driven sprocket (11) connected with the driving sprocket (3) by a chain (12) are installed at the bottom of the tank (1); and a gas inlet valve (14) installed on the pipe (1) and a hot air pipe (15) connected with the outer ring pipe (18) are installed outside the tank (1).    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the one-step anaerobic dry fermentation device.    Stirring motors (2)    Driving sprockets (3)    Vertical helix reducing motor (5)    Material pipe (6)    Vertical helix conveyer (7)