Battery charging and discharging tester

The invention discloses a battery charging and discharging tester which is used for testing charging and discharging performance of a to-be-tested battery. The battery charging and discharging tester is provided with an upper computer, a data transfer unit and a lower computer, wherein the upper computer is connected with the lower computer through the data transfer unit with serial bus RS-485 adopted. The upper computer is connected with the lower computer through the serial bus RS-485 to finish data communication between the upper computer and the lower computer. The lower computer includes a charging unit, a discharge load unit, a main control unit and the to-be-tested battery, wherein the charging unit, the discharge load unit, and the to-be-tested battery are respectively connected with the main control unit, and the to-be-tested battery and the discharge load unit are connected with the charging unit in sequence. Compared with the prior art, the battery charging and discharging tester has the advantages of being simple, convenient, reliable in quality, stable in running, high in measurement accuracy, reasonable in design, high in automation level and the like.