The utility model relates to an electrochemistry immunosensor with controllable magnetic field strength, which consists of an electrode device and a manipulator. The manipulator adjusts generation and elimination of an electrode magnetic field in the electrode device, and when the magnetic field is generated, the electrochemistry immunosensor is used for quantitatively detecting objective biological molecules. The electrochemistry immunosensor has the advantages of repeatability, simple structure, convenience in preparation and the like, can effectively detect the biological molecules quantitatively, is long in service life, accurate in detection results, simple in structure and low in cost, and the like. In addition, the service frequency of the electrochemistry immunosensor substantially exceeds 10 times.