The present invention discloses a passive UHF omnidirectional container electronic seal. It comprises a locking bar and a locking cap; the locking bar contains a locking bar hasing a RFID chip and a cable connector, wherein the RFID chip is electrically connected with the cable connector; and the locking cap hasing a plug-in unit, which is matched with the cable connector in the locking bar for connecting an antenna in the locking cap. The present invention combines the mechanical container seal in the present market with the RFID technology and adopts the ultra-high frequency (UHF) RFID technology, which has overcome numerous shortcomings to reach the long-distance transmission, the transmission distance can be up to 10 meters and with no direction, can resist more than 1.2 tons pulling force, and the appearance is novel, small, exquisite and cheap. In addition, the passive UHF omnidirectional container electronic seal of the present invention is one time use only without maintaining, which can provide the high efficiency and steady automation service on the container clearing customs and transportation management.