Microbial electrochemical sensor testing system and method

The invention discloses a microbial electrochemical sensor testing system and method. The system comprises a feeding device, a power pump, a protection device, a first three-way valve, a microbial electrochemical sensor and a second three-way valve, the protection device comprises a liquid storage cavity which can be arranged in a sealed mode, the liquid storage cavity is sequentially provided with an exhaust port, a second liquid level sensor and a first liquid level sensor from top to bottom, and the exhaust port is connected with a first stop valve; the setting heights of the first liquid level sensor and the second liquid level sensor on the liquid storage cavity sequentially correspond to a preset exhaust liquid level line and a preset maximum liquid injection line; an inlet of the liquid storage cavity is connected with the output end of the power pump through a pipeline, the pipeline extends into the liquid storage cavity, and an outlet of the pipeline is lower than the first liquid level sensor. And a