Abstract: Aimed at the security risks of the existing cloud storage data sharing audit schemes, such as user identity leakage and malicious users modifying the shared cloud data at will, a lightweight cloud sharing data auditing scheme supporting user identity traceability is proposed. The scheme adopted the method that the group administrator assisted the user to generate partial data tags to realize the identity privacy of the user. Two lists were introduced to record the members who made the latest modifications to each block. When a user maliciously modified the shared cloud data, the traceability of the malicious user’s identity could be achieved. The blind signature technology was used to realize the data privacy in the process of data tags generation. The security analysis proves that the proposed scheme is provable and secure, and the experimental analysis proves that the proposed scheme can realize the lightweight sharing among users side.