An access authentication method for a wireless local area network, WLAN, hotspot, comprising: updating an access password of the WLAN hotspot according to a preset update time interval, wherein the updated access password is generated according to a random generation algorithm; and authenticating access for a wireless workstation which is connecting to the WLAN hotspot through a soft Access Point according to the updated access password; wherein before updating the access password of the WLAN hotspot according to the preset update time interval, the method further comprises: activating an access password update function of the WLAN hotspot and setting the update time interval; wherein after authenticating access for a wireless workstation which is connecting to the WLAN hotspot through the soft Access Point according to the updated access password, the method further comprises: if the wireless workstation passes the authentication, detecting whether data traffic accessed by the wireless workstation is greater than a preset traffic threshold; and if the data traffic accessed by the wireless workstation is greater than the preset traffic threshold, disconnecting the soft Access Point from the wireless workstation. updating an access password of the WLAN hotspot according to a preset update time interval, wherein the updated access password is generated according to a random generation algorithm; and authenticating access for a wireless workstation which is connecting to the WLAN hotspot through a soft Access Point according to the updated access password; wherein before updating the access password of the WLAN hotspot according to the preset update time interval, the method further comprises: activating an access password update function of the WLAN hotspot and setting the update time interval; wherein after authenticating access for a wireless workstation which is connecting to the WLAN hotspot through the soft Access Point according to the updated access password, the method further comprises: if the wireless workstation passes the authentication, detecting whether data traffic accessed by the wireless workstation is greater than a preset traffic threshold; and if the data traffic accessed by the wireless workstation is greater than the preset traffic threshold, disconnecting the soft Access Point from the wireless workstation. activating an access password update function of the WLAN hotspot and setting the update time interval; wherein after authenticating access for a wireless workstation which is connecting to the WLAN hotspot through the soft Access Point according to the updated access password, the method further comprises: if the wireless workstation passes the authentication, detecting whether data traffic accessed by the wireless workstation is greater than a preset traffic threshold; and if the data traffic accessed by the wireless workstation is greater than the preset traffic threshold, disconnecting the soft Access Point from the wireless workstation. if the wireless workstation passes the authentication, detecting whether data traffic accessed by the wireless workstation is greater than a preset traffic threshold; and if the data traffic accessed by the wireless workstation is greater than the preset traffic threshold, disconnecting the soft Access Point from the wireless workstation.