The invention belongs to the technical field of marine organism pathogen detection, and in particular relates to a multiple-PCR detection method and a kit for simultaneously detecting WSSV (white spot syndrome virus), AHPND (acute hepatopancreatic necrosis disease), EHP (enterocytozoon hepatopenaei) and IHHNV (infectious hypodermal and hepatopancreatic necrosis virus) in prawns. With the application of the multiple-PCR detection method, amplification of four pathogen DNAs can be simultaneously conducted in one time by virtue of special detection primers, namely WSSV F and WSSV R, AHPND F and AHPND R, EHP F and EHP R as well as IHHNV F and IHHNV R of the WSSV, the AHPND, the EHP and the IHHNV. The multiple-PCR detection method provided by the invention is convenient and rapid, low in detection limit, strong in specificity, high in sensitivity and high in accuracy rate and is capable of simultaneously detecting the white spot syndrome virus, the acute hepatopancreatic necrosis disease, the enterocytozoon hepatopenaei and the infectious hypodermal and hepatopancreatic necrosis virus in the prawns.