Huanggangliang volcanic-extrusive uplift in the southern Da Hinggan Mountains is composed of the rhyolitic crystalline tuff of the ash flow facies, the dome of the extrusive facies (rhyolite porphyroclastic lava), porphyritic monzogranite of the superficial intrusive facies. Their SHRIMP zircon U-Pb ages are 140.27±0.93 Ma, 140.41±0.92 Ma and 141.75±0.96 Ma respectively, which were produced by magmatic activities in Early Cretaceous. The isotopic ages of the three lithofacies are consistent within the error range, indicating that there is no obvious discontinuity between the three lithofacies, and they are the products of continuous action of thick rich crystal magma (crystal mush). These volcanic-intrusive complexes belong to the high-K calc-alkaline series, and are mainly peraluminous and quasi-aluminous rocks, their εNd(t) change little which range from -0.43 to -0.08, and the corresponding two-stage Nd model ages range from 0.98 to 0.96 Ga, suggesting that originated from the same source region. The contents of SiO₂ and K₂O in magmatic products decreased continuously from early to late, and there is a certain complementary relationship between the compositions of different lithofacies, suggesting that rhyolitic crystalline tuff and rhyolite porphyroclastic lava may be discharged/emplaced layer by layer by magma chamber of composition zonation, and the residual magma is filled into the ring fissure of volcanic root and surrounding to form porphyritic monzogranite. The volcano-intrusive complex have the characteristics of A-type granite, which are characterized by LILE (Rb, Th, U, etc.) enrichment and HFSE (Ti, Nb, Ta, etc.) strong depletion, and enriched LREE patterns with strong negative Eu anomaly, and its genesis may be related to partial melting of the overlying crust induced by the upwelling of asthenosphere mantle or mafic magma underplating in the Early Cretaceous.