Wide-range stable and dynamic performance testing system for alkaline electrolytic cell

The wide-range stable and dynamic performance testing system comprises a to-be-detected alkaline electrolytic cell and a power supply system, the inlet end of the to-be-detected alkaline electrolytic cell is connected with a buffer unit, and the inlet end of the buffer unit is connected with a water source; the outlet end of the alkaline electrolytic bath to be detected is respectively connected with an oxygen separator and a hydrogen separator, and a liquid phase outlet of the hydrogen separator is communicated with the buffer unit through a first return pipe; a liquid phase outlet of the oxygen separator is communicated with the buffer unit through a second return pipe; the detection system is also provided with a temperature control unit; in the operation process of the system, supplemented pure water enters the buffer unit after being heated by the temperature control unit and then enters the alkaline electrolytic bath, and recovered alkaline liquor enters the electrolytic bath after passing through the b