Abstract: This study addresses the issues of low efficiency and poor accuracy in the dynamic balance detection process of automotive cooling fan blades by proposing an innovative modular inspection fixture design solution. Through the integration of optimized mechanical structures, sensor fusion technology, and intelligent control algorithms, full-process automation of blade dynamic balance detection has been achieved. The fixture incorporates three core modules: a layered feeding mechanism, a high-precision positioning system, and an adaptive compensation mechanism, combined with a closed-loop feedback control strategy, significantly improving detection efficiency and accuracy. Experimental results demonstrate that the fixture can complete a single detection cycle within 2～3 minutes, achieve balance clip positioning accuracy of ±0.05 mm, and increase the dynamic balance pass rate to over 99%. This research provides a new technical solution for quality inspection in the automotive components manufacturing field, with significant engineering application value.