The invention relates to an efficient vapor-water separation device and a separation method. The vapor-water separation device on a vapor generator is generally arranged at a vapor outlet, as vapor at the vapor outlet carries a lot of moisture, the moisture in the vapor needs to be separated before the vapor is discharged, and in the prior art, vapor is introduced from the lower part of a corrugated plate component, water separated in a corrugated plate is in contact with vapor entering the corrugated plate, and a vapor-water separation effect is achieved. The efficient vapor-water separation device comprises a component bottom plate (1), wherein the component bottom plate is connected with a group of corrugated plate (2), and is connected with angle steels (3); and the angle steels are connected with a device bottom plate (4). The efficient vapor-water separation device and the separation method are applied to vapor-water separation.