The Anninghe fault zone is a near north-south fault in the fault active system of the Sichuan-Yunnan block, and its deep structure and seismic activity have attracted much attention. In order to evaluate the seismotectonic environment and study the "relics" of mantle plume action in the northern section of Anninghe fault zone, this paper, based on the Jiulong-Zhaojue magnetotelluric sounding data, processed the data by various means, established the deep electrical structure model of the study area, and analyzed the geological structure data, drawing the following conclusions: (1) The deep electrical structure of the area is relatively complex, the surface and shallow strata are mainly distributed with medium and high resistivity, with uneven depth and thickness, the low resistivity layer of the middle and lower crust is developed, and there are relatively upwelling high resistivity bodies in the upper mantle of the Anninghe fault zone.(2)The main fault zones in the area show obvious electrical interface/electrical gradient zone in terms of electrical structure, and the low resistivity of the region near the fault zone may be related to the saline fluid filled inside.(3) The seismic sources in the study area are mainly distributed at the edge of the high-resistivity body, the high-low resistivity contact zone, and inside the low-resistivity body. The high-resistivity body has stronger rock mechanical properties, and the high conductor corresponds to the weak material in the crust. Under the dynamic background of the continuous southeast expansion of the Qinghai-Xizang Plateau, these forces are transmitted through the weak material and concentrated at the edge of the high-resistivity body, causing it to brittle fracture, thereby promoting the occurrence of earthquakes. (4) The axial high resistance body in Panxi tectonic belt is also a high speed, high density and high magnetic anomaly body, which may be the eruption channel of the Emeishan large igneous province and the accumulation channel of the thick basic ultrabasic rocks.