The invention discloses a fluorescent quantitative PCR diagnostic kit for rapidly detecting HER-2 mRNA, and relates to an oncogene detection technology. The fluorescent quantitative PCR diagnostic kit is composed of a first chain cDNA synthesis kit, a PCR reaction solution and a lightcycler PCR instrument. The first chain cDNA synthesis kit comprises MgCl2, a reverse transcriptase buffer, dNTP, a RNA enzyme inhibitor, Oligo (dT) 15, AMV reverse transcriptase and DEPC water, and synthesis of HER-2, a reference gene primer and a Taqman fluorescent probe; the primer is divided into an upstream primer and a downstream primer. The invention has the advantages of good specificity, sensitivity and repeatability, accurate quantification, rapidity and convenience, is suitable for specifically qualitative and quantitative determination of HER-2 gene at early stage, and provides better reference for the chemotherapy and prognosis for the clinical breast cancer.