A method for waking up a device, comprising: when a timing interval of a timer is equal to a preset threshold, detecting, by a first device, whether a second device transmits a radio signal, wherein the first device is a device waked up by the second device; and when the radio signal is not detected, disabling, by the first device, a wireless fidelity, Wi-Fi, and restarting the timer; characterized by determining, according to pre-stored wake-up information, whether the second device corresponding to the detected radio signal may wake up the first device; when the radio signal is detected, preforming the following steps: switching, by the first device, to a station, STA, mode; transmitting, by the first device, a first message to the second device, so that the second device switches to a station, STA, mode after receiving the first message, wherein the first message is used to notify the second device that the first device is waked up successfully; and switching, by the first device, to an access point, AP, mode, so that the second device implements Wi-Fi access through the first device, wherein the second device is switched to the AP mode for a duration T2 = T0 + 2 * T1, T0 being the preset threshold and T1 being a duration of a detection and access attempt for the first device; and wherein the second device registers the wake-up information with the first device, when the second device implements Wi-Fi access through the first device to pre-store wake-up information of the second device in the first device, and wherein the wake-up information comprise a Wi-Fi network identifier of the second device, a ciphering mode and/or a password. when a timing interval of a timer is equal to a preset threshold, detecting, by a first device, whether a second device transmits a radio signal, wherein the first device is a device waked up by the second device; and when the radio signal is not detected, disabling, by the first device, a wireless fidelity, Wi-Fi, and restarting the timer; characterized by determining, according to pre-stored wake-up information, whether the second device corresponding to the detected radio signal may wake up the first device; when the radio signal is detected, preforming the following steps: switching, by the first device, to a station, STA, mode; transmitting, by the first device, a first message to the second device, so that the second device switches to a station, STA, mode after receiving the first message, wherein the first message is used to notify the second device that the first device is waked up successfully; and switching, by the first device, to an access point, AP, mode, so that the second device implements Wi-Fi access through the first device, wherein the second device is switched to the AP mode for a duration T2 = T0 + 2 * T1, T0 being the preset threshold and T1 being a duration of a detection and access attempt for the first device; and wherein the second device registers the wake-up information with the first device, when the second device implements Wi-Fi access through the first device to pre-store wake-up information of the second device in the first device, and wherein the wake-up information comprise a Wi-Fi network identifier of the second device, a ciphering mode and/or a password. switching, by the first device, to a station, STA, mode; transmitting, by the first device, a first message to the second device, so that the second device switches to a station, STA, mode after receiving the first message, wherein the first message is used to notify the second device that the first device is waked up successfully; and switching, by the first device, to an access point, AP, mode, so that the second device implements Wi-Fi access through the first device, wherein the second device is switched to the AP mode for a duration T2 = T0 + 2 * T1, T0 being the preset threshold and T1 being a duration of a detection and access attempt for the first device; and wherein the second device registers the wake-up information with the first device, when the second device implements Wi-Fi access through the first device to pre-store wake-up information of the second device in the first device, and wherein the wake-up information comprise a Wi-Fi network identifier of the second device, a ciphering mode and/or a password.