RFID (Radio Frequency Identification) redundant data filtering method

The invention relates to a filtering method of RFID (Radio Frequency Identification) redundant data. The method comprises the following steps of: utilizing tag tuple data (TID (Terminal Identification), RID (Frequency Identification), time) to carry out redundancy judgment on a plurality of reader-writers; introducing an RSSI (received signal strength indicator) attribute to expand original tuple data (TID, RID, time, RSSI); and utilizing a reference tag to be combined with an RSSI characteristic, calculating an Euclidean distance of the tag to the reader-writers, and taking the size of the Euclidean distance as the evidence for judging the attribution of the tag, so as to realize the effective filtering of the RFID redundant data.