The invention relates to an efficient fog water collecting device and method. The device comprises a left cooling cavity and a right cooling cavity located on a base, a fog sinking area needed by fog water collection is formed between the two cooling cavities, a filter screen arranged obliquely is arranged in the fog sinking area, and one end of the filter screen is communicated with a fog water collector, the left cooling cavity and the right cooling cavity are both filled with cooling medium, a communicating pipe is arranged in the left cooling cavity, the communicating pipe guides fog passing through the filter screen after primary condensation to a condensation pipe, and the fog is pumped away by an air extractor after secondary condensation of the condensation pipe. Fog water generated in the secondary condensation process flows to the fog water collector, and the fog water collector is communicated with a fog water collecting bottle. The efficient fog water collecting device and method achieve efficient collection of fog water by designing a brand new structure.