The invention relates to an LAMP (loop-mediated isothermal amplification) quick detection method for vibrio alginolyticus. The detection method comprises the following steps: adding components in a reaction system according to a designed LAMP primer of the vibrio alginolyticus, controlling the amplification temperature to be 63.5 DEG C, reacting in a constant-temperature water bath pot for 45 minutes, heating at 80 DEG C for 2 minutes, and stopping reaction; identifying an amplification product through electrophoresis of 2% agarose gel, adding a nucleic acid dye, and identifying through color change. A result shows that the designed primer cannot crossly react with other common bacteria. The lowest detection limit of DNA (deoxyribonucleic acid) of the vibrio alginolyticus in an LAMP method is 2.08*10<-5> ng/mu l. The detection method is very high in detection sensitivity; the LAMP primer is very good in specificity; the constant-temperature reaction can be finished by only a constant-temperature water bath device, without expensive and precise instruments and equipment; the detection method has the characteristics of simplicity and convenience for operation, simplicity for detection and the like, and is especially suitable for field detection or detection of humble places such as outdoors.