An NB-IOT based wireless device group access method and terminal relate to the technology of smart home systems. The method includes that the NB-IOT based device group access terminal establishes (S601) a connection with an external device requesting to access an NB-IOT network; and when a command issued by the NB-IOT network to the external device is received, the NB-IOT based device group access terminal interprets (S602) the command into a communication command protocol supported by the external device and issues the communication command protocol supported by the external device to the corresponding external device; when information uploaded by the external device with the established connection is received, the NB-IOT based device group access terminal interprets (S602) the information into a communication command protocol supported by the NB-IOT network and uploads the communication command protocol supported by the NB-IOT network to the NB-IOT network.