The invention provides an automobile maintenance data storage method based on an alliance chain. At present, a traditional storage mode of the automobile maintenance data mainly adopts paper materialsand scattered local database storage, and the storage mode shows many defects in the aspects of integrity and usability of the maintenance data. According to the invention, a blockchain technology taking an alliance chain as a main part and a cloud storage technology are used, logic blockchain storage and physical cloud storage of maintenance data are realized, so that real maintenance data cannot be tampered and traceable once generated and submitted to a verification node and written into a block by a P-DPoS consensus mechanism, and a user can know the integrity of submitted data in time through a Merkle root verification method. Meanwhile, related cryptography technologies such as a public key encryption algorithm, a proxy re-encryption algorithm, an SOK protocol and the like are adopted, so that disclosure and sharing of part of maintenance data are realized under the condition of ensuring that personal identity privacy is not leaked, and great convenience is provided for a claimprocess of a user.