In recent years, geologists have paid more and more attention to the potential of tungsten and tin metallogenic of Caledonian batholith in Nanling metallogenic belt. In order to evaluate the tungsten and tin metallogenic potential of the Penggongmiao pluton in Hunan Province, mineralization age of the Shiniuxian tungsten deposit, diagenetic age and geochemical characteristics of biotite granodiorite from the Penggongmiao pluton are analyzed in this paper. The LA-ICP-MS zircon and monazite U-Pb ages of the coarse-grained biotite granodiorite of the Penggongmiao pluton are 436.1±2.5 Ma (MSWD=1.9, n=19) and 436.8±2.8 Ma (MSWD=2.7, n=20), respectively, while the muscovite ³⁹Ar/⁴⁰Ar isotopic dating of the Shiniuxian tungsten deposit has a plateau age of 150.2±1.2 Ma (MSWD=0.42). The results show that the diagenesis of rocks occurred in Early Silurian, while the mineralization of tungsten is dated to late Jurassic, and there are the products of different magmatic activities. Compared to the typical tungsten-tin granite in Nanling metallogenic belt, the Penggongmiao granite has low degree of differentiation and low content of ore-forming elements. In addition, the Penggongmiao granites are mainly derived from the poor-clay metasandstone of the upper crust, while the typical tungsten-tin granites are usually derived from the rich-clay of the upper crust material. The above evidences indicate that the mineralization potential of the Caledonian Penggongmiao pluton is limited. Finally, on the basis of comprehensive previous research results, the authors point out that the metallogenic potential of the Late Jurassic granite dikes or stocks in and around the Penggongmiao batholith should be evaluated by integrating geophysical, geochemical, structural and alteration information.