The invention discloses a method for producing fermented fish paste. The method for producing the fermented fish paste mainly comprises the steps of low-value fish raw materials, pretreatment (removal of scales, head, tails, internal organs and vertebras), soaking in salt vinegar water, draining, soaking in ozone water, draining, defibrination, salt addition, in-jar fermentation, seasoning, mixedhomogeneity and obtaining of finished products. The method adopts a salt vinegar water soaking method to remove fishy-smell substance, is scientific, easy to operate and good in effect. The salt vinegar water is used for soaking fish slices, and acetic acid promotes solubility of the fishy-smell substance (trimethylamine oxide and dimethylamine oxide) in water with the assist of the salt water and enables the fishy-smell substance to be solved in the water, thereby achieving the removal purpose. Ozone solution produced by an electrolysis type ozone generator is used for soaking and disinfection, sundry fungus pollution and usage of preservatives are reduced, and the requirement for green production is met. Self enzyme of fishes is utilized to perform natural fermentation, thereby ensuringgood taste and special flavor of the fish paste.