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Bill hook is a key part of Dbale knotter during load bearing. For the research on its mechanical analysis, baling experiment was carried out by using Huade 9YFQ-1.5 baler. The experimental scheme of tension sensor, high-speed camera and synchronous control was firstly proposed. The rope tension and acting position between rope and knotter during crop residue baling were obtained. The transfer model of rope around stump was built. The results showed that the largest loading between rope and bill hook was 314.89N. Based on the loading and acting position, the finite element mechanical analysis of bill hook was performed by ANSYS. The results showed that the stress concentration happened at the shaft end of bill hook and corner. The stress achieved to 755.52MPa and 410.29MPa, respectively. The observed broken position of bill hook during straw baling was also compared with the results from the finite element mechanical analysis. The results showed that the simulated data agreed well with the experimental data. This study will provide basic data for the optimization of bill hook.