Inorder to increase the adaptation of garlic harvester to different areas and row spacings, a kind of garlic combine harvester was designed and its key functional parts were also studied in depth. The garlic combine harvester was built by using modularization design methods. The independent harvesting function module had main functions of garlic harvesting such as garlic stem lifter, arrow shaped ripper, belt holding conveyor, garlic stem aligning and cutting device and garlic collector. A 1rowed to nrowed garlic combine harvester may be built by choosing the number of harvesting function module with different conveying units and chassises. At the same time, the spaces between the harvesting function modules may be changed steplessly from 0mm to 300mm, which will be suitable for 70~420mm rowspacing garlics mechanized harvesting. Based on the analyses of the influence factors, the garlic drawing forces’ theoretical model was bulit and its changing rule influenced by the structure parameters was also found out. And the experments proved that the drawing forces would be increased with the enlargement of the garlic stem contact angle which may be changed by the adjustment of the belt tension. The drawing force would be enough for the garlic harvesting after the soil ripping when the synchronous belt tension reached 2800N. Based on the soil ripping forces’ theoretical model, the changing rules influenced by the angle of the arrow shaped ripper to the ground, the penetrating depth of the ripper and the machine moving velocity were also researched in depth. Results of the orthogonal test showed that the penetrating depth of the ripper and the soil moisture content had significant influence on the soil ripping force. The soil ripping force was 520N as the penetrating depth of the ripper was 80mm and the soil moisture content was 30%. Field test results of prototype showed that the technical indicators of the garlic combine harvester met the expected results of design. Its harvesting rate was 98.3%, the loss coefficient which included the damaged and the lost garlic was 3.5% and the production efficiency of 1rowed harvester was 0.14hm2/h.