Taking the lifting mechanism of the high-speed wire strapping machine as the research object,in order to verify whether the designed hydraulic system can well balance the negative load generated during the return stroke of the hydraulic cylinder,and to verify whether the designed hydraulic cylinder driving force meets the requirements,the Multibody and Fluids modules in the MATLAB/Simscape toolbox were used to establish the mechanical-hydraulic co-simulation model of the lifting mechanism of the high-speed wire strapping machine and the simulation experiment was carried out.The results show that through the co-simulation,the driving force change of the hydraulic cylinder under the control of the hydraulic system during the lifting mechanism return stroke can be simulated well,the change in the driving force of the hydraulic cylinder indicates that the hydraulic system is effective in balancing the negative load,and the driving force of the hydraulic cylinder during the entire movement also meets the requirements,which verifies the rationality of the design.