Wi-Fi positioning method and device

The invention provides a Wi-Fi positioning method. The Wi-Fi positioning method comprises the steps that Wi-Fi information in an environment to be positioned is scanned; according to the Wi-Fi information, an address with the largest possibility is matched in a data record and used as a result of Wi-Fi positioning, wherein a known address and Wi-Fi information corresponding to the known address are saved in the data record. The invention further provides a Wi-Fi positioning device. The Wi-Fi positioning device comprises a scanning unit and a searching unit, wherein the scanning unit is suitable for scanning the Wi-Fi information in an ambient environment, the searching unit is suitable for matching the address with the largest possibility in the data record, the address with the largest possibility is used as the result of the Wi-Fi positioning, and the known address and the Wi-Fi information corresponding to the known address are saved in the data record. The invention further provides an indoor and outdoor seamless positioning system. The indoor and outdoor seamless positioning system comprises an outdoor positioning module, an indoor positioning module and a switching module. The Wi-Fi positioning method and the Wi-Fi positioning device improve Wi-Fi positioning accuracy and achieve a seamless positioning effect.