This paper focuses on the design of RF filtering front-end module. In view of the RF signal transmission and isolation problems involved in the miniaturized and highly integrated design of the module, a refined three-dimensional electromagnetic field modeling simulation analysis is carried out to improve the model accuracy. In order to verify the simulation design accuracy, the key structural model are fabricated and deembedding tested.And an L-band miniaturized RF filtering front-end module has been fabricated. The module size is 14.97 mm×12.01 mm×1.29 mm. The number of the integrated filters is 16. The insertion loss is ≤5.2 dB, and the out-of-band rejection is ≥42.5 dB.