The invention discloses a vacuum cutting method and a vacuum cutting device for vacuum suction of anode mud from a cell bottom. A winning cell with a hopper-shaped cavity bottom is adopted; the bottom of the hopper-shaped cavity bottom of the winning cell is provided with an anode mud outlet, so that the anode mud is gathered at the anode mud outlet of the bottom of the winning cell; the anode mud outlet is connected with a vacuum suction pipe which is connected with a vacuum separation device; and the anode mud generated by the winning cell passes through the vacuum separation device, is sucked into a vacuum liquid receiving device of the vacuum separation device through the anode mud outlet at the bottom of the hopper-shaped cavity bottom of the winning cell under the vacuum state, flows into a liquid seal device through a gravity mud discharge pipe, and is finally introduced into an anode mud storage tank or a leaching system through a process pump. The winning cell comprises a winning cell provided with a movable sealed cover and an open winning cell. The method and the device can be applied to all electrowinning processes.