The invention discloses a pressurization type liquid ring vacuum pump water return system with a rotating film, and relates to the liquid ring vacuum pump water return system applied in the fields of chemical engineering, machinery, exploration, electric power and the like. The liquid ring vacuum pump water return system comprises a vacuum pump body, a vapor-water separator, a feeding pipe, a discharging pipe, a pressurization pump, a rotating film area, a cooling liquid inlet, a vapor-water separation area, a heat exchange area, a commutating area, a flow guide plate, a gas-phase passage and an annular separating plate, wherein a rotating film tube is installed in the rotating film area, and the tube wall of the rotating film tube is provided with rotating film holes; a heat exchange separating plate is installed in the heat exchange area, and a heat exchange liquid inlet communicates with a water inlet of a lower heat exchange pipe; a heat exchange liquid outlet communicates with a water outlet of an upper heat exchange pipe; and the input end of the pressurization pump communicates with a separating liquid outlet, and the output end of the pressurization pump communicates with a water return port and the cooling liquid inlet. By means of the pressurization type liquid ring vacuum pump water return system with the rotating film, water return fluid disturbance can be reduced, and resistance is lowered. The invention further relates to a water return method of the pressurization type liquid ring vacuum pump water return system with the rotating film.