The utility model discloses an auxiliary device of airport luggage letter sorting system based on RFID sets up on the spout mouth of airport luggage letter sorting system, spout mouth end is equipped with the terminal baffle of spout, including RFID identification aerial, human infrared sensing probe far away, RFID read write line and photoelectric probe, photoelectric probe installs the entrance at the spout mouth, the RFID identification aerial includes a plurality of, sets up separately in the inside and outside both sides of the terminal baffle of spout, the outside at the terminal baffle of spout is established to the RFID read write line, human infrared sensing probe far away installs on the terminal baffle of spout, just the RFID identification aerial passes through radio frequency cable and RFID read write line communication connection. The RFID read write line is connected with the supervisory equipment electricity of airport luggage letter sorting system. This device can also accurate recording and is sent the tag information of luggage to backstage luggage information management system through data interface.