Haopinggou biotite granite porphyry is located at Shagou—Longmendian silver polymetallic ore district in the west of Xiong’er Mountain. It is important to accheive its age for discussing petrogenesis, geodynamic and esitmating mineralization potential. The zircon U-Pb dating method of LA-ICP-MS was used to confirm the age of Haopinggou biotite granite porphyry. The sample of HPG304 used to be dated is biotite granitic porphyry. There are 33 zircon spots were analysed, and 18 results of them are adjacent to n(207Pb)/n(235U)—n(206Pb)/n(238U) concordia, whose U-Pb ages are clustered in 2435±9Ma, 2310±13Ma~2340±10Ma, 1784±10Ma and 129±1Ma~131±1Ma. The weighted average n(206Pb)/n(238U) age of 8 zircon spots among 129±1Ma~131±1Ma is 129.9±0.6Ma (MSWD=0.69). The weighted average n(206Pb)/n(238U) age of total 13 zircons include 5 published zircon U-Pb isotopic results is 130.5±1.1Ma (MSWD= 3.5), which is regarded as the formation age of Haopinggou biotite granite porphyry. The ages of total 34 U-Pb zircon spots by SHRIMP and LA-ICP-MS methods from Haopinggou biotite granite porphyry have formed a zircon age spectrum from Proterozoic to early Cretaceous, which recorded the corresponding regional magmatic events. Haopinggou biotite granite porphyry is the product of lithosphere delamination in the early Cretaceous, and magma (fluid) mixing triggered by it forms the zircon U-Pb age spectrum. The formation time of Haopinggou biotite granite porphyry is close to the Mesozoic extensive and intense mineralization and diagenesis epoch in Xiaoqinling Mountain—Xiaoshan Mountain—Xiong’er Mountain area, and deep fluids was rapidly discharged in the process of lithosphere delamination. Excellent geophysical and geochemical anomalies around Haopinggou biotite granite porphyry have found. It should be considered as one of prospecting targets in Shagou—Longmendian silver polymetallic ore district.