A wireless Internet access method for a host device, comprising: simulating, by a wireless Internet access module, a device management port and a modem port of a wireless Internet access processing function unit of the wireless Internet access module as a secure digital card partition and reporting the secure digital card partition to a host side; receiving, by the host side, information of the secure digital card partition reported by the wireless Internet access module, and loading a serial port driver and a modem driver corresponding to the wireless Internet access module; and encapsulating a command or data delivered by an application layer to the device management port or modem port using a secure digital card interface format, and mapping the encapsulated command or data to the secure digital card partition of the wireless Internet access module; receiving, by the wireless Internet access module, the command or data encapsulated using the secure digital card interface format from the host side, decapsulating the encapsulated command or data, and transferring the decapsulated command or data to the device management port or modem port, so as to manage the wireless Internet access module through the device management port, or implement dial-up Internet access through the modem port; processing, by the device management port, a device management command or management data, and generating response data, wherein the command or data delivered to the device management port comprises the device management command or management data; processing, by the modem port, a dialing command or dialing data, and generating response data, or, receiving data from an external network, wherein the command or data delivered to the modem port comprises the dialing command or dialing data, or the data sent to the external network; encapsulating, by the wireless Internet access module, the response data or the data from the external network into a data packet in the secure digital card interface format; and reading, by the host side, the data packet encapsulated using the secure digital card interface format, decapsulating the data packet, and reporting the response data in the data packet or the data from the external network to the application layer, wherein the encapsulating the command or data delivered by the application layer to the device management port or modem port using the secure digital card interface format comprises: encapsulating the command or data into a data packet of a small computer system interface, SCSI, write request command. simulating, by a wireless Internet access module, a device management port and a modem port of a wireless Internet access processing function unit of the wireless Internet access module as a secure digital card partition and reporting the secure digital card partition to a host side; receiving, by the host side, information of the secure digital card partition reported by the wireless Internet access module, and loading a serial port driver and a modem driver corresponding to the wireless Internet access module; and encapsulating a command or data delivered by an application layer to the device management port or modem port using a secure digital card interface format, and mapping the encapsulated command or data to the secure digital card partition of the wireless Internet access module; receiving, by the wireless Internet access module, the command or data encapsulated using the secure digital card interface format from the host side, decapsulating the encapsulated command or data, and transferring the decapsulated command or data to the device management port or modem port, so as to manage the wireless Internet access module through the device management port, or implement dial-up Internet access through the modem port; processing, by the device management port, a device management command or management data, and generating response data, wherein the command or data delivered to the device management port comprises the device management command or management data; processing, by the modem port, a dialing command or dialing data, and generating response data, or, receiving data from an external network, wherein the command or data delivered to the modem port comprises the dialing command or dialing data, or the data sent to the external network; encapsulating, by the wireless Internet access module, the response data or the data from the external network into a data packet in the secure digital card interface format; and reading, by the host side, the data packet encapsulated using the secure digital card interface format, decapsulating the data packet, and reporting the response data in the data packet or the data from the external network to the application layer, wherein the encapsulating the command or data delivered by the application layer to the device management port or modem port using the secure digital card interface format comprises: encapsulating the command or data into a data packet of a small computer system interface, SCSI, write request command.