The development characteristics and occurrence form of igneous rock invading coal measure strata showed different irregularity from sedimentary rock. Affected by this, the stress distribution of surrounding rock of coal roadway driving under the roof of igneous rock intrusive body was complex, the pressure manifestation degree was different, and the long-term deformation of local surrounding rock was difficult to self-stabilize, which brought great challenges to the support and later maintenance of roadway. In this paper, the irregularity of igneous rock intrusion roof was analyzed from two aspects of igneous rock intrusion horizon and intrusive roof shape, and the development principle, surface morphology and lithologic physical characteristics of irregular igneous rock intrusion roof were summarized. On this basis, combined with the surrounding rock failure characteristics of working face, the FLAC 3D numerical simulation software was used to simulate the stress distribution of roadway surrounding rock under the roof conditions of multiple types of irregular igneous rock intrusions, and then the pressure behavior law of roadway surrounding rock under the roof condition of irregular igneous rock intrusion was analyzed and summarized. The analysis results showed that the pressure behavior of roadway surrounding rock under the condition of along coal erosion igneous rock roof was stronger than that under the condition of intruding igneous rock roof along the top floor directly, the surrounding rock was more vulnerable to damage.