The present invention relates to a dual-circular-polarization chipless identification system. The system comprises three innovation points: (1) a card reader employs a dual-circular-polarization transceiver antenna to identify randomly disposed tags in a non-line-of-sight range and improve the transmit-receive isolation; (2) the tags have no chips and are only formed by loops of conductive structures, conductive ink comprising graphene is employed to directly print the tags at the surfaces of objects such as papers, cloth, plastic and the like, the chipless tags can employ materials sensitive to the environment temperature and humidity to monitor the changing of the environment temperature and humidity, and the chipless tags can be also arranged in an object to be detected to be used for secretive places; and (3) a dummy structure is added to improve the information capacity of the chipless tags.