This invention provides a modularized ocean energy generating device including an outer frame, at least four inner frames, and at least four hydraulic generator modules. The at least four inner frames are detachably disposed in the outer frame. The at least four hydraulic generator modules are disposed in the at least four inner frames, respectively. The modularized ocean energy generating device in the invention includes at least four built-in modules, and the hydraulic generator modules can be distributed in an array. By the detachable inner frames and the outer frame, modularized assembly and installation can be realized, thereby greatly reducing preserving and installing costs.