The invention discloses a docetaxel immunogen, a synthetic method of the docetaxel immunogen, an anti-docetaxel antibody obtained by the immunogen, a detection reagent and a preparation method of the anti-docetaxel antibody. The docetaxel immunogen disclosed by the invention is synthesized by brand-new docetaxel derivatives and has the advantage of high immunogenicity, an anti-docetaxel specific antibody with high specificity and binding force can be obtained by induction, and any cross reaction with common 62 medicines is avoided. According to the docetaxel detection reagent prepared from the antibody, the content of docetaxel in a sample can be conveniently and accurately determined, and clinical individualized treatment is promoted. Compared with the method in the prior art, the detection reagent disclosed by the invention can realize high-flux and rapid detection on a fully automatic biochemical analyzer and has the advantages of simple and convenient operation, high sensitivity, high specificity, accurate result and the like, the detection cost of the docetaxel can be effectively reduced, and the detection reagent is suitable for large-scale clinical popularization and application.