There is a complicated stress state in Yunnan and the main research object in this paper is the Luquan seismic zone. The Luquan seismic belt is located in the Xiaojiang fault zone in the southern section of the North-South Seismic Belt within China's borders. The complexity of the stress field of the Luquan seismic zone gives it great research value as the focal-mechanism solution in the area contains a great amount of information about the focus of earthquakes. In this paper, we use the seismic moment tensor of the Yunnan Luquan earthquake and the focal mechanism solution of its main shock and aftershocks from the inversion of previous scholars, and refer to the Global CMT Catalog for the focal mechanism solutions of several earthquakes based on the Luquan earthquake. We transform the seismic moment tensor into a focal mechanism solution and then use a stress-field inversion program to invert the focal mechanism solution and obtain the stress field of the Luquan earthquake and surrounding areas. Then, we compare the differences between the two stress fields. We found the principal compression stress field of the hypocenter in the Yunnan Luquan earthquake to be in the NNW-SSE direction. Also, we found the principal compression stress to be equivalent to the principal extensional stress, and that of surrounding areas to be in the NW-SE direction. Furthermore, the facture surface of faults, mainly down strike-slip faults have a large slope angle and the principal compression stress is in a dominant position. However, we found Yunnan to be primarily affected by the principal compression stress in the NNW-SSE and NW-SE directions, given the impact of its location and the longitude and latitude of its surrounding areas. Therefore, in general, Yunnan is affected by compression stress in the NW-SE direction, with some areas affected by compression stress in the NNW-SSE direction. These research results can be used to analyze the mechanism of earthquakes and the seismic geological background and formation conditions of the faults in the area. They also have some significance in promoting relevant research on the geodynamic environment in the Yunnan region.