The Pucheng district is located in Wuyi metallogenic belt, which is in the northern part of the northwest Fujian uplift zone, consisting of more than 30 fluorite mines (mineralization spots). We take Waiyang fluorite mine, Nanshanjian fluorite mine, Lichu fluorite mine, Longtouyang fluorite mine and Renfeng mineralization spot as the main research examples in this study. The geochemical analysis of fluorite and monzonitic granite hosting rocks were carried out. The fluorite ore has massive, banded, vein-like structure. It mainly includes fluorite-type ore and quartz-fluorite type ore. The ΣREE content of fluorite ranges from 12.22×10^-6 to 154.44×10^-6, the Y content is between 5.68×10^-6 and 114.90×10^-6, the ratio of LREE/HREE in fluorite ranges from 1.10 to 4.67, (La/Yb)_N ratio ranges from 0.85 to 5.04, δEu ratio ranges from 0.55 to 1.05, and δCe ratio ranges from 0.73 to 0.95. The ΣREE content of monzonitic granite ranges from 74.13×10^-6 to 340.42×10^-6, the Y content ranges from 15.37×10^-6 to 90.49×10^-6, LREE/HREE ratio in hosting rock ranges from 1.54 to 15.47, (La/Yb)_N ratio ranges from 0.85 to 42.51, δEu ratio ranges from 0.10 to 0.72, and the δCe ratio ranges from 0.36 to 1.64. The monzonitic granite is peraluminous with high-potassium calc-alkaline characteristic, and is enriched in large ionic lithophilic elements (Rb) and high field strength elements (U and Th), and depleted in high field strength elements (Zr). The REE normalized pattern shows a gentle right curve, and plots into plate granite (WPA). I-type granite has a strong relationship with the fluorite mineralization. Monzonitic granite is enriched in F, which is the main source of fluorite mineralization. The fluorite in the study area was formed in a hydrothermally-generating low-temperature reduction environment. The fluorite deposit occurred in the NE trending fault zone, which also has undergone at least two phases of fluorite mineralization.