The invention aims to provide a device and method for a large-scale bubble environment in a reduced pressure environment. A high-speed camera is arranged in the place one meter away from an oval observation window of a reduced pressure container, a soft-light lamp is arranged in the place 0.5 meter away from an oval observation window on the opposite side of the reduced pressure container, a soft-light lamp is arranged in the place 0.5 meter away from a round lighting hole in one side of the reduced pressure container, a hydraulic forklift is arranged on a lighting window on the other side of the reduced pressure container, the hydraulic forklift and a stuffy cover flange of the reduced pressure container are fixed together, electrode holders are fixed to the stuffy cover flange, and the lower ends of the electrode holders are each connected with an electrode. A bubble generating system and a computer are placed in the place 2 to 3 meters away from the reduced pressure container, a capacitor in the bubble generating system is connected with the electrodes in the reduced pressure container through pipe joint wires on a first stuffy cover flange and a first transparent cover flange, and the computer is connected with the high-speed camera. A vacuum pump is placed in the place 2 to 3 meters away from the reduced pressure container and connected with a small round hole in an oval seal of the reduced pressure container. Through the device and method, a real underwater process can be well simulated.