At present, deep coalbed methane can be effectively developed through large-scale extreme fracturing technology of horizontal wells, but the deep coalbed methane strata have high stress and complex natural fracture development characteristics, and the effect of conventional fracturing or large-scale fracturing of straight wells is unclear, and the risk of development is still high. Straight well multi-round fracturing technology has achieved better test results by enhancing fracture complexity through multiple steering fracturing. In order to evaluate the effect and adaptability of multi-rotation fracturing modification in deep-seated CBM direct wells, the study analyzes the fracture expansion law of multi-rotation fracturing under different stress environments and natural fracture development conditions by setting up an integrated model of geo-engineering, establishes a model of complex fracture network, and clarifies fracture characterization parameters through numerical simulation and history fitting, and evaluates the predicted range of mobilization, EUR, and other key indexes. The study concludes that multi-round fracturing is conducive to the formation of complex fracture network, the degree of reserve utilization is relatively high, and the predicted EUR of typical wells can reach 4140 × 104 m3; the degree of natural fracture development and geostress has a significant impact on the effect of multi-round fracturing; the more developed the natural fracture and the larger the difference between two directions of stress, the more likely to be affected by the natural fracture in the multi-round fracturing, the degree of complexity of fracture network decreases, the scope of modification becomes smaller, and the development effect becomes poorer after fracturing. After fracturing, the complexity of fracture network will be reduced, the transformation range will be smaller and the development effect will be worse. The multi-round fracturing technology of deep CBM direct wells can be a powerful supplement to the large-scale extreme fracturing technology of horizontal wells, and has a large implementation potential, which is expected to improve the overall development effect of the block.