The invention discloses an eSIM card and a working method thereof. The working method comprises the following steps that in response to an initialization command, a specified number of subareas are reserved in a trusted security component, and an auxiliary security component is set; a secure communication connection with the management server is established by using the connection information; theinitialization command is sent to a management server; operator server communication information issued by the management server is received, wherein the operator server communication information comprises operator server communication public information and operator server communication private information; operator server communication public information is stored in the blank sub-regions; operator server communication private information is stored in the auxiliary security component. According to the invention, the security management of the eSIM card can be realized, the operation of theeSIM card under the security framework is ensured, and meanwhile, the security framework is used for managing all operation data in the eSIM card from publishing, transmission, management and deletion, so that the security of the overall operation of the eSIM card is ensured.