Provided are a miniature base station accessing method and system. The method comprises the steps that a miniature base station obtains an MAC address of the base station through OAM and sends a registering request to a network safety system through a gateway; the miniature base station is placed at a macro network cell, and the registering request comprises a local position cell number, the MAC address and a global cell identification code of a macro network searched by the miniature base station; or the miniature base station is placed at an island cell, and the registering request comprises the local position cell number and the MAC address; and the network safety system judges whether the local position cell number is correct, if yes, whether the global cell identification code of the macro network exists is judged, if yes, the global cell identification code of the macro network is subjected to authentication, if authentication is passed, the miniature base station is allowed to be accessed into a core network, if the global cell identification code of the macro network does not exist, the MAC address is subjected to authentication, and if authentication is passed, the miniature base station is allowed to be accessed into the core network. According to the scheme, the judging accuracy of the accessing position of the miniature base station is improved.