The invention discloses a method and system for controlling external insertion devices in a BIOS. The method for controlling the external insertion devices in the BIOS includes the steps that clamping groove position information of the external insertion devices is obtained, and device name information of the external insertion devices is obtained; the clamping groove position information and the device name information are combined and dynamically generate a main control option of the external insertion devices; according to all port devices of the external insertion devices, sub-control options, corresponding to the port devices, of the main control option are generated; according to requirements, the main control option and the sub-control options control the corresponding external insertion devices and the port devices. By means of a method for dynamically generating external insertion device control options, the options are generated in a BIOS interface, the independent control function of the external card insertion devices can be achieved, basic information of the external insertion devices can be displayed, and people do not need to have access to an operation system to know the basic information of all the external insertion devices of the current system and whether the external insertion devices are correctly recognized or not. The system is universal, high in practicality, easy to implement and easy to popularize.