Abstract: Aiming at problems of large vibration, easy damage, and low efficiency of cutting device of industrial hemp cutting and paving machine during cutting and paving operation, kinematic and dynamic theoretical analysis and calculation were carried out on cutting device, and mass of balance block balancing inertia force was 6.672 kg．Based on ADAMS software for simulation analysis, displacement, velocity, and acceleration curves of cutting device were obtained to verify correctness of design．Inertial force data were obtained, in which inertial forces in x and y directions increased with a certain range, but inertial force in z direction was reduced by 95.7%, and inertial resultant force was reduced by 15%．Field reliability experiment results showed that the first failure time was increased by 6 times after adding balance weights, average failure interval was increased by 8 times．Average failure interval of whole machine detected by a third party was 60 hours, which was better than standard value of industrial hemp 40 hours．Designed cutting device was reasonable, and added balance block could effectively improve efficiency of cutting device and meet mechanized harvesting requirements of industrial hemp in China．