As a product of the combination of information and energy technology, the energy internet is enormous and complex, and the absence of security safeguards at any aspect of it can cause incalculable damage. Aiming at the problems that Energy Internet terminals are difficult to be trusted and the integrity of massive terminals cannot be guaranteed, this paper designs and implements a set of comprehensive credibility measures and security protection schemes, isolates various malicious operations, and ensures that the system is always in a credible state. Specifically, we develop a secure TF card control program in the Android terminal application layer to realize the overall security scheme. Experimental results prove that this security protection scheme can effectively detect illegal application packages in energy Internet terminal devices, resist malicious programs, and protect key data from theft at the same time, achieving security protection in the "thing-to-thing" interconnection scenario of the Energy Internet.