In order to fully understand the evolution characteristics of magma since the Eocene in the coastal batholith of northern Peru, and to explore the formation age, petrogenesis and tectonic environment of intrusive rocks, intrusive rock samples were systematically collected from west to east in the coastal batholith. Zircon U-Pb geochronology data show that the age of intrusive rocks is divided into two periods, 52Ma-47Ma and 36Ma-28Ma, respectively, and has the characteristics of gradually becoming new from west to east. The geochemical characteristics of the samples are calc-alkaline to high-K calc-alkaline. They are obviously enriched in large ion lithophile elements such as Rb, Ba and Sr, and relatively depleted in high field strength elements such as Ti, P and Ta. The normalized rare earth element distribution patterns of chondrites show a right-leaning type of light rare earth enrichment, with obvious negative Eu anomalies. The (Sr/Y)-Y diagram and Rb-(Y+Nb) diagram show the characteristics of island arc magmatic rocks. Rb/Sr ratio and Th/ U ratio are close to the characteristics of crustal magma. The (La/Ba)-(La/Nb) diagram indicates the characteristics of the lithospheric mantle source region. The ( A/MF)-(C/MF) diagram shows that most of the samples fall into the partial melting zone of the basic rock. Combined with the tectonic background of the subduction of the Nazca plate to the South American continental plate and the characteristics of the geochemical and chronological data of the samples, it is considered that the magma of the two intrusive rocks has homologous characteristics, and the magma source area may be derived from the partial melting of the basic lower crust and the contamination of the lithospheric mantle material. Under the low-angle slab subduction of the Nazca plate, the magmatic arc in northern Peru migrated eastward, and the time limit of crustal uplift and thickening of the north of Peru was slightly later than 30 Ma in the central and southern regions and would be about after 28 Ma.