The invention relates to a surface enhanced Raman spectrum detection method for antioxidant BHT (Butylated Hydroxytoluene), which comprises the steps of: adopting gold nano particles as an enhancing reagent, and mixing the gold nano particles with an antioxidant BHT test sample solution for carrying out surface enhanced Raman spectrum detection so as to measure the content of antioxidant BHT in atest sample. The surface enhanced Raman spectrum detection method is simple and convenient to operate, has high analyzing speed and high sensitivity, is applicable to large-scale BHT detection, and is expected to be widely applied in the fields of food, medicine and the like.