The invention provides an automatic calibration device of portable charge / discharge equipment. The device comprises a fixture tool, a relay execution module, a communication transit module, an upper computer and a high-precision multimeter, wherein the communication transit module is in communicating connection with the relay execution module, the upper computer and the high-precision multimeter respectively; the fixture tool is connected with the relay execution module; and the relay execution module is connected with the high-precision multimeter. The automatic calibration device has the advantages that operation is simple, and the requirement on the speciality of calibration personnel can be lowered; calibration time can be shortened, and test efficiency can be improved; and the test error rate is lowered, and test cost is lowered.