Abstract: Micro-cultivator is widely used in hilly and mountainous tobacco fields for cultivated land operation．Long-term shallow tillage makes soil plough layer shallow, soil harden and plough bottom thicken, which seriously affects yield and quality of tobacco leaves．According to characteristics of hilly and mountainous tobacco fields under ridge planting mode, a center of gravity balance crawler type deep tillage machine for mountainous tobacco fields was designed, which was mainly composed of walking device, power system, rotary tillage device and center of gravity balance mechanism．Structure and working principle of each device were expounded．Key structure was designed, and kinematics analysis of rotary tillage process of rotary tillage device was carried out to determine walking speed of whole machine and rotation speed of rotary blade．' Hui ' -shaped cultivated land method was adopted, and a center of gravity balance mechanism for ridge operation was proposed for this method．Discrete element method was used to analyze ridge operation of deep cultivator．Cultivated land test was carried out in ridge tillage tobacco field．Results showed that deep tillage machine had good operation performance, and land was flat after tillage．Average tillage depth qualification rate of whole machine was 95.4 %, and average soil crushing rate was 91.9 %, which met requirements of tobacco planting．Accuracy and rationality of theoretical analysis and design of crawler deep tillage machine in tobacco field were verified．Research results could provide reference for research of deep plowing machine in hilly and mountainous tobacco fields．