Immunodetection chip, immunodetection device and using method

An immunodetection chip, comprising:

• a substrate, and
• a cover plate;
• wherein the substrate is disposed opposite to the cover plate to form a detection chamber;
• one side, facing the cover plate, of the substrate is fixedly provided with substrate antibodies, and an inside wall of the detection chamber is provided with a detection member;
• wherein the detection member is located between the substrate and the substrate antibodies, and a biological modification layer is disposed between the substrate antibodies and the detection member;
• wherein the biological modification layer is made of nanogold and directly in contact with the substrate antibodies and the detection member respectively;
• wherein the detection member is configured to output a corresponding electrical signal while adsorbing biological magnetic beads via the biological modification layer;
• wherein the substrate antibodies match with target antigens.