In the context of dynamic stealth networks within the power grid, device access must accommodate the dynamic characteristics of the network while also addressing privacy concerns. Currently, power information systems lack adequate protection for the privacy of device access information. This paper proposes an access control scheme that enables stealthy device access. The scheme employs a hierarchical multi-attribute trust evaluation algorithm to assess and securely classify device attributes. Trust levels are used as attributes for access control to achieve device stealth. By using trust levels and other attributes as the basis for resource permission allocation, the scheme dynamically adjusts and allocates resource access permissions, making access control more granular and flexible. Additionally, the proposed scheme supports the revocation of permissions for authorized devices and allows devices to request higher-level resource permissions.