NOVELTY - The device has a stator fixed in an outer side of a loading unit (740), which is mounted in a body (100). A generator shaft (200) rotates along a center axis of the stator to generate power. The stator rotates along with flow of water around the generator shaft to apply hydraulic power in a water blade (110). The stator is connected to a coil of a sun gear (510) that is fixed to the generator shaft. A micro-electric generator shaft (620) is pivotally mounted on the body. A planetary gear (610) generates power in the coil. A buoyancy device (400) is mounted on the generator shaft.    USE - Hydro electric power generation device.    ADVANTAGE - The blade is mounted on the body, which is rotated with hydraulic power of flowing water to generate power, thus easily installing the device in a place where depth of water is low i.e. river. The device is simple in structure and is manufactured easily since the stator is equipped inside a permanent magnet and a rotor is equipped inside the coil, thus facilitating power generation. The planetary gear moves between the sun gear and the micro-electric generator shaft so that number of rotation of the micro-electric generator shaft is more than the number of rotation of the body, thus improving power generation efficiency. The micro-electric generator can be manifoldly arranged to increase plant capacity. The buoyancy device is mounted on both ends of the generator shaft. The generator shaft is mounted to the holder to be moved up and down so water way and gap between a sleep apparatus and the blade are regularly maintained and weather influence is minimized, thus facilitating torque of the body for uniformly generating power. The generator shaft can be easily removed from a holder before generation of flood or typhoon, thus facilitating installation and separation according to time and place. The device arranges an output beam to the generator shaft, which does not rotate to avoid entanglement of the output beam during rotation of the body. The device can protect the body to be waterproof-processed with the generator shaft and does not contact with water.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional front view of a hydro electric power generation device.'(Drawing includes non-English language text)'    Body (100)    Water blade (110)    Generator shaft (200)    Buoyancy device (400)    Sun gear (510)    Planetary gear (610)    Micro-electric generator shaft (620)    Loading unit (740)