Permission verification method, device and system and storage medium

The embodiment of the invention discloses a permission verification method, device and system and a storage medium, and the method comprises the steps: verifying the identity of a target account and the relation between the target account and a to-be-accessed account, and generating a verification bill of the target account according to a verification result; sending the check ticket to a target account; receiving a data access request sent by the target account, the data access request being generated in response to an operation of accessing data of the to-be-accessed account triggered by the target account, the data access request including the verification bill; and according to the verification bill in the data access request, determining whether the target account has the right to access the data of the to-be-accessed account. According to the method, the convenience of management and maintenance of the verification permission can be effectively improved, repeated verification for one data access request