Protecting privacy data is an important research content of IPv6 wireless sensor networks security. Since information hiding technology can achieve the invisibility of data, it plays an important role in privacy protection. In view of the characteristics of IPv6 wireless sensor networks and the security requirements of data concealment, combined with the theory of compressed sensing, the transmission overhead is concentrated on the convergence node. Using compressed sensing to effectively reduce the overhead of the sensing layer node, this paper proposes an information hiding method for IPv6 wireless sensor networks. The method mainly includes the hidden key management, the embedded algorithm and the extraction algorithm, which provides confidentiality for the transmission of sensitive data of the IPv6 wireless sensor networks to ensure the security and the reliability of sensitive data. The results show that the information hiding algorithm has less than 25% communication overhead with the increase of sensitive data.