An organic waste decomposition device comprises a base frame (110), a cylindrical shell casing (120), a shaft (130) which is rotatably installed in the shell casing, a plurality of arm blades (140) which Are engaged to the shaft, a driving motor (150) adapted to provide a rotational force to the shaft, a ring blower (160) which is adapted to supply air into the interior of the shell casing, an air pipe (170) which is adapted to connect the ring blower and a lower portion of the shell casing, a pre-heater (180) which is adapted to pre-heat the air supplied into the interior of the shell casing, a condenser (190) which liquidefies the discharged vapor, a steam pipe (200) which connects an upper portion of the shell casing and the condenser, and a control box (210).