The utility model discloses an electrochemical modified electrode used for detecting clenbuterol, which comprises a substrate electrode, a multi-wall carbon nano tube arranged on the outer surface of the substrate electrode, an EDC-NHS (1-ethyl-3-(3-dimethyl ami-nopropyl)carbodiimide-N-Hydroxysuccinimide) crosslinking agent layer arranged on the outer surface of the multi-wall carbon nano tube, a clenbuterol monoclonal antibody layer arranged on the outer surface of the EDC-NHS crosslinking agent layer, and a BSA (Bovine Serum Albumin) sealing agent layer arranged on the outer surface of the clenbuterol monoclonal antibody. The utility model further discloses a detector taking the modified electrode as a working electrode. The modified electrode, provided by the utility model, has the advantages of high sensitivity and good selectivity, and is used for detecting clenbuterol, and by adopting an environmental-friendly material, pollution cannot be produced.