Quantitative pump capable of adjusting suction and displacement and test solution analyzer

The utility model discloses a metering pump capable of adjusting the suction and discharge capacity and a test solution analyzer. The metering pump capable of adjusting the suction and discharge capacity comprises a mounting cavity defined by a mounting sleeve; the electromagnet assembly is connected to the mounting sleeve, at least part of the electromagnet assembly is located in the mounting cavity, and the electromagnet assembly is concavely arranged to form a limiting groove; the adjusting rotary rod is movably connected to the electromagnet assembly, and one end of the adjusting rotary rod protrudes out of the groove bottom of the limiting groove. The movable iron block is arranged in the mounting cavity and is in sliding connection with the electromagnet assembly, and the electromagnet assembly is electrified to magnetically attract the movable iron block to be embedded in the limiting groove in a sliding mode and abut against the adjusting rotary rod; the elastic piece is located in the sliding directi