The Miaogou lead-zinc polymetallic deposit is a newly discovered small-scale deposit located on the periphery of the Qingchengzi ore province. Fluid inclusion microscopic lithofacies identification and testing results show that fluid inclusions in the Miaogou lead-zine polymetallic deposit are well-developed, with sizes ranging from 3 pmx2 m to 15 umx4 um. They are predominantly irregular and elliptical, with a few rectangular and triangular forms. The inclusions are mainly two-phase gas-liquid inclusions with a gas-liquid ratio of 5 %-45 %, mostly occurring in clusters, with some isolated. The main mineralization temperature ranges from 270 °C to 300 °C, salinity ranges from 0.99 % to 5.17 %,indicating Iow-salinity fluids, and density ranges from 0.70 g/em3 to 0.79 g/cm ', indicating low-density fluids. Calculated ore-forming pressures range from 5.0 MPa to 8.9 MPa, with a mineralization depth of 0.50 km to 0.89 km. Hydrogen and oxygen isotope analysis shows 8'8Ov-sMow values of 10.89 %0-12.50 %o and & Dv-sMow values of -97.8 %o to -55.8 %o. suggesting mixed fluids with multi-source evolution. The characteristics of ore-forming fluids in the Miaogou lead-zinc polymetallic deposit significantly differ from those in the Qingchengzi ore province, indicating that they do not belong to the same mineralization stage. Comprehensive analysis suggests that the Miaogou lead-zinc polymetallic deposit is an epithermal medium-low temperature fractured and altered rock-type deposit.