Abstract: In order to improve the harvesting efficiency of Brassica campestris ssp. chinensis var. rosularis as well as reduce labor time and labor intensity, a small electric caterpillar type Brassica campestris ssp. chinensis var. rosularis harvester was designed. Based on literature, field investigation, theoretical calculation and computer-aided technology, and according to the growth characteristics and harvest requirements of Brassica campestris ssp. chinensis var. rosularis, the overall structural design scheme of Brassica campestris ssp. chinensis var. rosularis harvester was determined. The main design contents included cutting device, conveying device, stubble height adjustment device, walking device, and collection device. Using theoretical calculation of key components, the parameters of key devices such as cutting, conveying and stubble height adjustment were determined. The structural linear static simulation analysis of the whole frame was carried out. The simulation results showed that the maximum deformation of the whole frame was 0.929 mm and the maximum equivalent stress was 117.8 MPa, which met the requirements of structural design and material strength. When verifying the performance of the harvester, the prototype of the harvester was tested by taking the Brassica campestris ssp. chinensis var. rosularis in Rugao Brassica campestris ssp. chinensis var. rosularis planting base in Jiangsu Province as the test object. The test results showed that when the Brassica campestris ssp. chinensis var. rosularis harvester was cutting under the soil, the average height of the stubble was about 10.5 mm, the harvest efficiency was not less than 0.09 hm~2/h, and the missing cutting rate was less than 5%. Additionally, the power consumption was about 28.77（kW·h）/hm~2, the average price of electricity was 0.51 yuan/（kW·h）, and the cost per hectare was 14.67 yuan. In this regard, the test index met the harvest requirements of Brassica campestris ssp. chinensis var. rosularis.