The invention discloses a preparation method of an instant leisure flavored fermented fish product. According to the invention, living carp is used as a raw material to be prepared into the instant leisure fermented fish product with unique flavor through the steps of pretreatment, cutting into blocks, curing, drying, preparing a leavening agent, blending, sealing and fermenting. The method is combined with low-salt curing technology, microorganism mixed inoculation technology and temperature controlled fermentation technology on the basis of conventional fermented sour fish, so that the quality and safety of the sour fish can be improved, the storage period can be prolonged, the production cycle can be effectively shortened, the production efficiency can be increased, standardized and large-scale production can be facilitated, the earthy smell of freshwater fish can be removed, ester can be produced to enhance aroma, and the mature flavor and taste of the fish product can be increased. The fish product produced by adopting the method is soft and high in resilience of the meat, bright in color and thick in acid taste, can be eaten after being unsealed, and can be developed into an instant leisure flavored product.