The invention discloses a method for preparing fishskin fish-scale collagen 
protein. The method includes the steps of 
processing fishskin, 
processing fish scale, preparing collagen 
protein and the like. The 
fish scale processing includes the steps of preprocessing, decalcifying, neutralizing and removing immunities, washing, injecting 
sol, 
solid and liquid separation, filtering and obtaining a water-soluble collagen solution generated after 
fish scale is removed. The collagen 
protein preparing includes the steps of 
hydrolysis, enzymolysis, collagen protein filtering and separation, 
enzyme deactivation, decolorization, fishy smell 
elimination, 
drying and the like. The ash content in obtained 
collagen peptide is obviously lower than that of other enzymolysis methods, and no fishy smell exists. According to the method, 
hydrolysis is conducted on collagen through compound 
protease and bromelain, the yield of micromolecule 
collagen peptide is high, and the enzymic preparation is low in cost and free of 
bitter taste. By means of the method, the production cost of the 
collagen peptide can be lowered remarkably, the obtained collagen 
peptide is white and tasteless 
powder, the ash content is smaller than 0.5%, and 
peptide fragment with the molecular weight smaller than 3000 Da accounts for over 96% of 
total nitrogen.