Abstract: In view of low efficiency of artificial excavation，high production cost and problem of garlic injury caused by uneven excavation depth of traditional excavation tools in process of garlic flat cultivation and harvesting in China，an innovative design was designed for garlic harvester deep-limiting excavation device suitable for garlic cultivation.Overall structure and working principle of garlic harvester deep-limiting excavation device was introduced.A mathematical model of excavation of deep-limiting of imitation terrain was established，and conditions of deep-limiting of imitation terrain were expounded.Through field test and data collection of the device，operating parameters of garlic harvester deep-limiting excavation device were obtained.Results showed that when excavation depth was 11.99 cm and input inclination was 24.5 degrees，excavation resistance of test index could be minimal，and minimum value was 3 163.9 N，which met requirements of garlic excavation harvest.