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The south coastal of Taizhou lies on the magmatic rock belt along the southeast coast of China, which has a complex regional geological structures, intense tectonic movement, and frequent magmatic activities. On the basis of the latest aeromagnetic data, combined with regional geology, gravity, and magnetic susceptibility information, integrated interpretation of the regional aeromagnetic anomalies and their reflected faults was completed. According to the block features in different zones of the reduction to the pole aeromagnetic data, the magnetic field characteristics and relationship with the structure division were described in detail. The different characteristics of the magnetic field are the concentrated reflection of tectonic movements, magmatic activities, and stratigraphic distributions; the fault structure, especially deep and large fault structures, was inferred and studied. The fault structures were mainly distributed in the NE, NNE, and NW directions, with approximately equal spacing between them. The magnetic anomaly is mainly characterized by the boundary, gradient zones, and beaded anomalies in a different magnetic field. The faults are not only important tectonic boundaries in this region but also tectonic belts that control the distribution of mineralization. Under the interaction of these faults, they form the basic structural pattern of the east–west zone and the north–south block. The NE faults have the largest scale and obviously control the different magnetic fields and magmatic activities. The results can provide a reference for further study of the distribution and activity characteristics of magmatic rocks in the coastal zone.