An electrochemiluminescence immunoassay method is disclosed and uses a full reaction of a Ru(bpy) marked protein-primary antibody, a biotinylated protein-secondary antibody to be tested, and a sample to be tested; addition of a Streptavidin-coated magnetic particle to form a complex comprising an antigen, an antibody, and a magnetic particle; adsorption to an electrode surface by the magnetic particle; addition of a dibutyl ethanolamine solution; and testing by an electrochemical method. Also disclosed is a corresponding electrochemiluminescence immunoassay detection kit.