The invention discloses a RFID omnidirectional dynamic scanning antenna system and particularly relates to a RFID omnidirectional dynamic scanning antenna system in the field of RFID antenna mechanisms. The RFID omnidirectional dynamic scanning antenna system of the invention comprises a power supply, a controller, a driving system, a RFID directional antenna, a RFID read and write module, a rotating motion transmission mechanism, a reciprocating swing transmission mechanism, an antenna base, an antenna rotating seat and an antenna fixation support; the controller is connected with the drivingsystem; the controller is connected with a data communication port of the RFID read and write module; an output terminal of the rotating motion transmission mechanism is connected with the antenna rotating seat ; the RFID directional antenna is installed on the antenna fixation support. The RFID omnidirectional dynamic scanning antenna system has high gain, long coverage distance, wide coverage range, and can effectively eliminate blind area of coverage and significantly reduce the number of antennas.