The malachite green test card applies the principle of competitive inhibition immunochromatography. During the flow of the sample, the peacock green binds to a specific monoclonal antibody labeled with colloidal gold, inhibiting the binding of the antibody to the peacock green BSA conjugate on the NC membrane detection line (T line), resulting in a change in the color of the detection line. The entire testing process is simple and fast, and results can be obtained within 20-30 minutes, suitable for various enterprises and testing institutions.