The present invention relates to an evaporative condenser performance test device. The evaporative condenser performance test device of the invention comprises a fresh air and sensible heat unit, a test room and a tested evaporative condenser; exhausted air of the tested evaporative condenser passes through an exhausting chamber and the fresh air and sensible heat unit sequentially so as to be discharged to the outside; the fresh air and sensible heat unit supplies fresh air from the outside to the test room through an air feeding pipe; the exhausted air and the fresh air perform heat exchange in the fresh air and sensible heat unit; the exhausting chamber is provided with a humidification and circulation fan which makes the exhausted air in the exhausting chamber returned to the test room; the tested evaporative condenser, a liquid storage device and an evaporator form a refrigerant circulation loop; the access of the tested evaporative condenser are provided with a refrigerant temperature and pressure measuring point; and the connection pipeline of the liquid storage device and the evaporator is provided with a flow meter A. With the evaporative condenser performance test device of the invention adopted, the performance testing of the evaporative condenser product can be realized, and the testing cost of the evaporative condenser can be greatly reduced; the state of fresh air entering the test room can be controlled, so that the test requirements of evaporative condensers with different capabilities under different working conditions can be satisfied.