The invention provides a cloud storage integrity detection method for recovering lost secret keys, and a system applying the cloud storage integrity detection method. The system comprises a parameter generation center module, a cloud module, a secret key distribution center module, a group member module and an audit center module. Through the adoption of the system, when the secrete keys of members in a group are lost, the conditions that new secrete keys are regenerated and signatures are regenerated for part of data can be avoided; the secrete keys can be verified, namely, each member in the group can verify whether the secrete key sent by a secrete key distribution center is correct or not, and the user of which the secrete key is lost can also verify whether the share, sent by other t+1 members in the group, is correct or not, so as to avoid the condition that the secret key distribution center or the user distributing the share to the user of which the secrete key is lost is dishonest; when the secrete keys are recovered, the secrete keys of the members are blinded, so that all the members do not know the secrete keys of the others. Therefore, the secrete key recovering safety is improved, and a cloud is prevented from being framed by malicious users.