The disclosure discloses a wireless access device (2), which includes: a wireless module (204) which establishes a wireless connection with a network, a solid state memory (203) partitioned into different storage volumes, a driver management module (202) and an enumeration management module (201). In the solid state memory, the fourth storage volume stores a bootstrap, the first storage volume stores an operating system and system management software, and the third storage volume stores encryption driver management software, device drive software and device management software. The driver management module (202) stores storage volume information. The enumeration management module (201) enumerates the fourth storage volume storing the bootstrap as a driver after the wireless access device is powered on, and is switched to a host mode or a peripheral device mode according to the received command indicating to switch to the host module transmitted by the bootstrap which is run on computer device and the storage volume information in the driver management module. The disclosure also discloses a wireless access method. The purpose of the disclosure is to provide the wireless access device which is easy to be maintained and convenient for carry, and the wireless access method, so as to improve user experience and security.