Abstract: The present application provides a tube connector sealing structure configured to seal connecting portions among a tube, a connector main body and a nut, including a sealing ring, a supporting ring, and a retaining ring which are all arranged at an outer side of the tube, wherein an outer side end of the retaining ring and an outer side end of the sealing ring respectively abut against a threaded end opening of the connector main body and a clamping end of the nut, and one end of the supporting ring presses against an inner side end of the retaining ring, and a right angled cooperative connection is formed between the other end of the supporting ring and an inner side end of the sealing ring. The present application further discloses a tube connector having the above tube connector sealing structure.