The continuous development of information technology and the popularization of intelligent terminal devices have led to the continuous growth of the total amount of global data storage, and the threats and challenges faced by data have increased with the prominence of their importance. However, currently, some computing and storage devices still lack data protection modules or have weak data protection capabilities. Existing data security storage technologies generally protect data through encryption, but data encryption and decryption operations, or data protection processes, are usually performed on the applied devices, resulting in threats to the security of stored data when the applied devices are subjected to various attacks. In response to the above issues, this study proposes a DICE-based Internet of Things (IoT) device attestation storage scheme, which utilizes trusted IoT devices built based on the lightweight root of trust DICE to provide secure storage services for general-purpose computing devices (collectively referred to as hosts), moves data encryption and decryption operations to trusted IoT devices, and eliminates threats to stored data caused by risks such as host memory attacks. This study mainly includes the following three aspects: (1) building a trusted IoT device by using the root of trust DICE to provide a security prerequisite for providing trusted services; (2) establishing a DICE-based remote attestation mechanism and access control mechanism to achieve secure authentication and establish a secure communication channel; (3) using the trusted IoT device to provide trusted and secure storage services for legitimate host users, which achieves secure data storage and takes into account isolation and flexibility in the use process. The experimental results show that the secure storage service provided by this scheme has a high file transfer rate and high security, which can meet the requirements for secure data storage in general scenarios.