Tidal current power generation device fixed at water bottom

The utility model provides a tidal current power generation device fixed at the water bottom. The tidal current power generation device comprises an outer framework, at least three inner frameworks, at least three horizontal-axis hydro-generators, at least three rotary shafts, multiple outer sleeve pipes and multiple inner sleeve pipes. The at least three inner frameworks are separately arranged in the outer framework and internally provided with the at least three horizontal-axis hydro-generators. At least one horizontal-axis hydro-generator is correspondingly arranged to each rotary shaft. At least one rotary shaft is correspondingly arranged to each inner framework. At least three driving units are connected with the rotary shafts in order to drive the rotary shafts to rotate. The multiple outer sleeve pipes are fixed at the outer framework. One part of each inner sleeve pipe is connected with a corresponding bottom end of each outer sleeve pipe and the water bottom.