The invention discloses a water purifier performance testing bench used for testing performance of water purifiers before delivery. The water purifier performance testing bench comprises a stand, which is provided with a pure water flow meter, a waste water flow meter, a booster pump pressure test meter, a raw water pressure test meter, a raw water inlet valve, a waste water outlet valve, a pure water outlet valve, and four adapters. The second adapter is connected with the water inlet of the pure water flow meter, and the water outlet of the pure water flow meter is connected with the pure water outlet valve. The fourth adapter is connected with the water inlet of the waste water flow meter, and the water outlet of the waste water flow meter is connected with the waste water outlet valve. The first adapter and the third adapter are connected with the booster pump pressure test meter by a tee. A raw water box is disposed in a cabinet disposed in the lower part of the stand, and is connected with an inlet of a raw water pump. The outlet of the raw water pump is connected with the raw water inlet valve and the raw water pressure test meter at the same time. The testing bench is advantageous in that the testing meters, the valves, and the adapters are integrated into one body, and by simple pipe connection, the performance tests of a plurality of water purifiers are carried out at the same time, and in addition, operation is easy, and efficiency is high.