An instrument that integrates charging and discharging, and can completely simulate the charging and discharging process of the battery. The power supply part adopts linear power supply mode, which ensures low ripple noise of the output power supply, and can replace the battery to test the function or performance of the PCBA board of ordinary adapter or mobile power supply. It is mainly used in the development and experiment of battery charging and discharging products such as mobile power supply, adapter, Bluetooth headset and Bluetooth speaker, and can also be used as a common adjustable power supply. Its input/output voltage and input/output current protection values can be set in multiple groups.