The invention discloses a multiplex PCR primer group for detecting porcine epidemic diarrhea virus, porcine transmissible gastroenteritis virus and porcine rotavirus simultaneously, and belongs to the field of virus detection. The primer group comprises three pairs of primers, wherein the primer sequences of the first pair of primers used for detecting the porcine epidemic diarrhea virus are respectively SEQ ID NO:1 and SEQ ID NO:2, the primer sequences of the second pair of primers used for detecting the porcine transmissible gastroenteritis virus are respectively SEQ ID NO:3 and SEQ ID NO:4, and the primer sequences of the third pair of primers used for detecting the porcine rotavirus are respectively SEQ ID NO:5 and SEQ ID NO:6. Through the application of the sequences of the primers, different strains of the porcine epidemic diarrhea virus, the porcine transmissible gastroenteritis virus and the porcine rotavirus can be detected simultaneously through the multiplex PCR method, and the detection results of the porcine epidemic diarrhea virus, the porcine transmissible gastroenteritis virus and the porcine rotavirus are masculine, while the defection results of other common pig-derived viruses are feminine, in conclusion, the primer group is strong in specificity, and good in repeatability; the PCR detection is carried out after the virus cDNA is subjected to gradient dilution, which shows that the sensitivity of the primers is high.