Porcine circovirus type 2（PCV2） is a major pathogen causing porcine respiratory disease complex（PRDC）, porcine dermatitis and nephropathy syndrome（PDNS）, postweaning multisystemic wasting syndrome（PMWS）, etc. The diseases caused by mixed infection of PCV2 with different viruses or bacteria have different clinical characteristics, which makes it difficult to detect the etiological factors and unable to prevent and block the infection in advance, and thereby leading to enormous economic losses in the pig industry. Therefore, advanced diagnostic techniques of PCV2 infection is particularly important for the prevention, diagnosis and prognosis of PCV2. This paper summarizes the research status and development trend of the diagnosis techniques of PCV2 infection in recent years, in order to indicate the direction for the future research and development of the diagnosis techniques of PCV2 infection.