A device for obtaining energy by pressing fluid comprises a hydraulic oil cavity, a moving cavity, a guide component, a rotating wheel and a driving motor. The rotating wheel is connected with the driving motor through a rotating shaft. The hydraulic oil cavity is filled with hydraulic oil, the moving cavity is arranged in the hydraulic oil cavity, two corresponding cavity walls of the front faceof the moving cavity are provided with holes separately, spherical rotating seal parts are installed at the holes separately and provided with through holes, and the guide component is installed in the through holes. The guide component comprises a horizontal straight arm and an inclined straight arm, one end of the horizontal straight arm and one end of the inclined straight arm are fixed to theinner wall of the hydraulic oil cavity, and the other end of the horizontal straight arm and the other end of the inclined straight arm are free ends and are located in the moving cavity. The spherical rotating seal parts are installed at the holes through fixing bearings. The device for obtaining energy by pressing fluid can be widely applied to power equipment, communication media, electrical power systems and industrial production equipment; and pressing energy consumption generated in the process of pressing fluid can be reduced, and thus the energy conversion efficiency is improved.