Abstract: A preparation method and an application of sea cucumber protein peptides are disclosed. The disclosure develops a preparation method of sea cucumber protein peptides with simple operation and excellent product quality by optimizing raw materials and enzymolysis extraction process of sea cucumber protein peptides. On the one hand, the problem that the deodorization and decolorization effect of the sea cucumber peptide hydrolysate of the prior art is not obvious is solved. On the other hand, the obtained sea cucumber protein peptides can be processed into nutritional supplements and used as raw materials for preparing health care products or cosmetics for enhancing immunity, relieving physical fatigue, resisting oxidation and aging, which has good development and utilization potential.