Deep coalbed methane resources boast abundant reserves and serve as a major contributor to unconventional oil and gas production enhancement. However, earlier extraction practices often encountered issues such as poor overall stimulation effectiveness and uneven fracture initiation and propagation. This study focuses on the No. 8+9 coal seam reservoir in the Linxing–Shenfu block on the eastern margin of the Ordos Basin. Through an integrated approach combining laboratory experiments, numerical simulation, and field tests, a composite diversion technology system for inter‐layer and intra‐layer temporary plugging in deep coalbed horizontal wells was proposed and implemented. The results indicate that a powder‐to‐granule ratio of 1:2 in the composite diversion materials achieves optimal plugging performance, effectively promoting fracture network complexity. CFD‐DEM numerical simulation optimization suggests that the pod diameter should be 1.7-2.0 times the perforation diameter. During field trials, operational methods such as "pump shutdown combined with intra- and inter-fracture composite diversion," "continuous pumping composite diversion," and "full-process dynamic diversion" were employed. Integrated with microseismic monitoring analysis, these trials confirmed that composite diversion can significantly enhance fracture network complexity and propagation uniformity, increase the stimulated reservoir volume (SRV), and clarify the matching relationship between diverter dosage and proppant placement stages. This study provides a theoretical basis and technical reference for the efficient stimulation of deep coalbed methane.