Abstract: In order to further improve the data security of agricultural machinery components in the design process, ensure the assembly collaboration and operation persistence among components, and ensure the overall field operation efficiency of agricultural machinery, the collaborative design of agricultural machinery components under the data security was studied.Based on the fully understand the current design method of agricultural machinery parts, the data security module was added, the safety collaborative model of agricultural machinery parts design was established, the data security architecture system and the key steps of structure design were formed, and the transmission of agricultural tractor was selected as an application example to test.The results showed that: through the combination of data security technology and collaborative design concept, the internal data security processing module run well, and the safety index and design collaborative performance in the overall design process could reach 95.13% and 96.64% respectively.It optimized the design method of agricultural machinery parts ontology, protected the core technical data in parts design, and realized the innovation from different angles of design level, which would be a good inspiration and reference for the in-depth research of scholars in the industry.