The present invention refers to a method for obtaining dehydrated food with a high content of hydrolyzed proteins from fish stickwater; for this purpose, the insoluble solids and fat traces are separated the stickwater, which then undergoes a process of demineralization by electrodialysis, in order to then adjust its temperature and pH to proceed with the enzymatic hydrolysis that allows to fractionate the protein, which is then concentrated and spray dried, and then the dried product is finally conveniently packaged.