The invention relates to a multiple PCR method for detecting seven fish viruses synchronously. The sequences of the primers of used multiple PCR primer set are SEQ IDs ranging from No.1 to No.36, the multiple PCR method provided by the invention adopts the special multiple PCR technology, 9 sets of specific primers, namely 36 specific primers, are designed and screened, the method for amplifying fish virus specific gene fragments through a single tube synchronously is built, an amplifying system and an amplifying method are optimized, and finally, high-flux, high-sensitivity, and quick and synchronous detection to seven common fish viruses can be achieved.