The invention belongs to the technical field of electronics, communication and automatic control, and relates to a building floor determining method based on Wi-Fi signal fingerprint information. Thebuilding floor determining method provided by the invention, a floor information database is established by using the difference between an AP (wireless access point) identifier that can be received by each building floor receiver and signal strength; when the receiver enters the building, the receiver matches the data in the database according to received Wi-Fi signal information and obtains thecurrently located floor by coarse layering and precision layering processing. The building floor determining method provided by the invention has the effects and beneficial effects that no other auxiliary device is needed other than the Wi-Fi access point, highly positioning of the receiver can be achieved by using the arranged access point in the building, the calculation complexity is low, and the floor height determining accuracy is relatively high.