The invention provides an extraction method of a zinc element in low-grade lead-zinc ore. A device used in the extraction method comprises a vacuum reduction smelting device, the total content of a lead element and the zinc element in the low-grade lead-zinc ore is lower than 20 wt%, and the zinc element and the lead element exist in the mode that zinc silicate, zinc carbonate, zinc sulfide, leadcarbonate and lead sulfide coexist. The extraction method comprises the following steps that in the vacuum reduction smelting device, reduction smelting on the low-grade lead-zinc ore, a reducing fueland white lead ore is conducted to obtain metal zinc and lead-containing slag. Compared with a method adopting other raw materials to prepare the metal zinc and the metal lead, the extraction methodhas the advantages that the low-grade lead-zinc oxide ore is adopted as a raw material to prepare the metal zinc and the metal lead, so that the preparation cost can be greatly reduced; and the extraction method is adopted to enrich and separate the zinc element in the low-grade lead-zinc oxide ore in the form of a zinc elementary substance, and the reduction volatilization rate of the zinc element in the raw material can reach about 99%.