The utility model discloses a portable transponder tester, which comprises a detection host and a detection antenna unit, wherein the detection host and the detection antenna unit are connected through a feeder; the detection host comprises a power supply module, a detection mainboard, a data processing unit, a power supply switch and an interface, the power supply module is connected with the detection mainboard and the power supply switch, and the detection mainboard is connected with the data processing unit and the interface. According to the utility model, a convenient detection means can be provided so as to implement checking on the quality of transponder equipment at regular intervals, and replacement or repair is carried out timely when a fault is discovered.