The invention relates to the field of animal specimen making, and provides a method for fast copying a fish head model, wherein the method includes the following steps: (1) rinsing a fish head with clear water, then rinsing with deionized water, drying, then coating the surface of the fish head with a brightener and a demoulding agent; (2) finalizing a design and adjusting the opening size of a fish mouth to a copying posture, and filling the fish mouth with an impression material; (3) stuffing the fish head into the impression material, allowing to stand until completely solidifying, and thusobtaining an original female mold; (4) after wind drying, rotating to take out the female mold, rinsing with clear water, drying, then carrying out mold cavity correction on the female mold, and coating the interior of the mold cavity with a brightener and a demoulding agent; (5) adjusting and preparing a casting material, and slowly pouring the casting material into the female mold at a high place at uniform velocity; and (6) after completely solidifying, opening the mold, taking out the fish head model, demoulding, cleaning and repairing. The method has the advantages that the fish head canbe quickly copied, the effect is more realistic and practical, the maneuverability is high, and the method is easily applied to production of a fish peeling specimen.