The invention relates to a triazophos monoclonal antibody. The triazophos monoclonal antibody is characterized in that the amino acid sequence of a heavy-chain variable region of the antibody is shownas SEQID NO:1, and the amino acid sequence of a light-chain variable region of the antibody is shown as SEQID NO:2. The invention relates to an application of the triazophos monoclonal antibody to colloidal gold detection test paper. The colloidal gold detection test paper comprises a liner, as well as a sample pad, a gold marker combination pad, a cellulose membrane and a water absorption pad which are sequentially arrayed on the liner, wherein the inner part of the gold marker combination pad is adsorbed with a triazophos gold marker antibody, a detection line and a control line are formedin the cellulose membrane, the detection line is printed with a triazophos hapten coupled carrier protein solution, carrier protein adopted in the carrier protein solution is prepared through couplingO-ethyl-O-(1-phenyl-1,2,4-triazole-3-based)-N-(butyric acid based) thiophosphate ester with bovine serum albumin (BSA) in an active ester method, and the control line is printed through a rabbit antimouse IgG antibody. The triazophos monoclonal antibody disclosed by the invention is high in specificity, high in sensibility, simple, convenient and quick to detect, vivid, audio-visual and accuratein result display, wide in application range and convenient to popularize, and fees are saved.