The invention discloses a network breakdown re-access method based on an internet of things embedded Wi-Fi module. The method comprises the steps that the Wi-Fi module is powered on in an STA mode; whether a designated router is searched for or not is judged, and if the designated router is searched for, the Wi-Fi module has access to the designated router; if the designated router is not searched for, the module waits for a while, is automatically switched to an AP mode, and works for a while in the AP mode, whether the designated router is searched for or not is continuously judged, and if the designated router is not searched for, the steps are continuously circulated; if the designated router is searched for, the module is switched back to the STA mode and has access to the designated router. Due to an outage or a network breakdown or poor signals, the router can not be connected with the internet. When the power grid is restored and reconnection is required, the technical scheme is adopted, the complexity caused when home use consumer products like a smart home deal with the Wi-Fi network faults is greatly reduced, and the most critical problem of the popularization of an internet of things Wi-Fi device is solved.