Based on 20 395 items of P-wave initial motion data of 3 036 earthquakes from 2008 to 2018, the stress field at the junction of Shanxi, Shaanxi, and Henan Provinces was inverted and calculated by using the composite focal mechanism method, and the distribution of fine stress field in the shallow part of the study area (0.15°×0.15°) was obtained. The results showed that: (1) Most areas at the junction of Shanxi, Shaanxi, and Henan Provinces are mainly under the strike-slip and extensional stress regime. The orientation of the principal compressive stress axis is NE-NEE, and the orientation of the extension stress axis is nearly NS, indicating that the Shanxi rift basin is a product of typical strike slip and extension; (2) The characteristics of compressive stress field around Huashan piedmont fault and Luoyang basin reflect that the thrust mechanism is the main component in these two areas; (3) The maximum P-wave contradiction ratio appears in the area between Fengmenkou-Wuzhiling fault zone and Xin'an-Jiaxian fault zone, indicating that this area with complex stress field is controlled by the dual effect of extension and strike slip; (4) There are obvious heterogeneity characteristics in the stress field at the junction of Shanxi, Shaanxi and Henan, which is mainly reflected in the transition area between uplift and depression.