A method and an apparatus for secure interaction between terminals, where the method includes indicating or indirectly indicating, by a companion terminal with an embedded Universal Integrated Circuit Card (eUICC), a Hypertext Transfer Protocol (HTTP) over Secure Socket Layer (HTTPS) Uniform Resource Locator (URL) including security information to a primary terminal such that the primary terminal initiates establishment of a local Transport Layer Security (TLS) connection according to the HTTPS URL, receiving, by the companion terminal, an HTTP request from the primary terminal using the local TLS connection, completing establishment of an HTTPS session when the companion terminal determines that the HTTP request includes the security information, and receiving, by the companion terminal, an operation instruction for the eUICC from the primary terminal using the HTTPS session.