An automated WLAN radio map construction method and system is provided. The automated WLAN radio map construction method includes: collecting WLAN fingerprints obtained by mobile device in an indoor space, machine-learning a learning model which is generated based on a state diagram in which divided areas of an indoor map are expressed by location states, arranging the collected WLAN fingerprints in corresponding location states, and storing a result of the arranging. Accordingly, collection locations of WLAN fingerprints collected in a plurality of unspecific smartphones without reference location information such as GPS signals can be automatically labeled.