The invention relates to the field of biotechnology, and discloses an anti-β-receptor agonist cluster-specific monoclonal antibody hybridoma cell line and the monoclonal antibody secreted therefrom. The hybridoma cell line of the present invention is prepared from salbutamol artificial antigen, and the monoclonal antibody secreted by it can simultaneously recognize salbutamol, clenbuterol hydrochloride, terbutaline, bromobuterol and sibuterol and other β-receptor agonists, Has cluster specificity; the immunoaffinity chromatography gel prepared from this is mixed with other β‑receptor agonists, such as ractopamine, as a purification reagent for machine test pretreatment and HPLC‑FLD, LC‑MS / The combination of MS detection technology can efficiently detect various clenbuterol components in pork, pig liver and pig urine samples, with high accuracy and sensitivity.