The invention discloses a multi-core cross-chain service cooperation system and an interactive method based on a cloud platform, including cloud platforms. cross-chain business collaboration includesthe collaboration between the customer core and the automotive manufacturing enterprise core, the multi-core and cross-chain business cooperation system between the automobile manufacturing enterprises and the automobile parts processing enterprises. The interaction method includes: setting up the interaction between between an automobile and after-sale comment module, a customer order operation feedback module, a logistics management module, and a vehicle part quality communication module on the cloud platform; service cooperation among automobile manufacturing enterprise nuclear, machiningenterprise of automobile parts, and customer cores reflects the diversity of choices and collaboration, the customer order operation feedback module safeguards the interests and rights of customers and automobile enterprises. Customer or expert evaluation can provide the improvement direction for automobile manufacturing enterprises and parts processing enterprises, and promote the automobile industry to advance, innovate and develop continuously.