<p>The Solonker suture zone (SSZ) and its surrounding areas have undergone multiple tectonic activities, including the closure of the Paleo-Asian Ocean during the Paleozoic, the closure of the Mongol–Okhotsk Ocean during the Mesozoic and the subduction of the Pacific Plate during the Mesozoic and Cenozoic. These activities have resulted in a complex deep structure in the region. Previous studies have preliminarily indicated the presence of electrical anisotropy in the lithospheric structure of the Solonker Suture Zone and its adjacent areas. To further investigate the electrical anisotropy in this region, we utilized broadband and long-period measurement data collected from the L1 profile from 2010 to 2012 and the L2 profile from 2017 to 2018. Through dimensionality and induction vector analysis of the data, the results indicate that the underground structure in this area exhibits 2D characteristics and electrical anisotropy. Subsequently, we employed the mare2dem code developed by Kerry Key to jointly invert the MT data, obtaining 2D isotropic and anisotropic resistivity models, which further confirmed the electrical anisotropy in the region. Based on the analysis of the resistivity models, it is inferred that the anisotropic origin of the Solonker Suture Zone is related to graphite and sulfide minerals present in the fold hinges, with the graphite layers possibly originating from black shales caused by the subduction of the Paleo-Asian Ocean. The analysis of the anisotropic resistivity models for the two profiles indicates that the Paleo-Asian Ocean experienced bidirectional subduction and multi-stage closure, with the closure direction being from west to east.</p>