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Aiming at the problem that die cutter frame was repeatedly disassembled due to unreasonable axial preload of bearing, the axial preload force of cutter roller bearing on die cutter holder was studied. Optimization methods and shortcomings of die cutting tool roll structure and bearing preload were summarized. Mathematical models were respectively established for limiting axial preload under minimum interference condition and maximum interference state by using relation between fit interference volume and axial preload . Based on finite element technique, optimization method of axial preload of die cutter bearing was proposed, and reliability verification was carried out using six Sigma method in ANSYS Workbench. The research results show that when the bearing meets the limit axial load condition, the actual assembly axial preload is maintained between 9 231.89 N -11 552.05 N. After the optimization, the maximum equivalent stress of the cutter roll in the minimum and maximum interference state is reduced by 7.2% and 5.1%, the maximum deformation in the minimum and maximum interference state is reduced by 6. 9% and 5. 1 %, and the reliability of the axial preload is improved by 49%. The problem of repeated disassembly during assembly of the die-cutting tool holder is improved. [ABSTRACT FROM AUTHOR]