An anti-counterfeiting RFID tag structure includes a body and a RFID device disposed on the body. The body is an O-ring. The RFID device includes a RFID chip circuit and an antenna structure. The anti-counterfeiting RFID tag structure is disposed fully between the cap and the opening of the bottle container whenever the bottle container is sealed. A user reads anti-counterfeiting ID code and product curriculum vitae data stored in the RFID device, using a stationary or handheld RFID reader, so as to effectuate identification and anti-counterfeiting.