Some fishmeal manufacturers are profit-making, adulterating and harming users in the production of fishmeal; Some are doped with urea to increase the nitrogen content, which can stand the test of nitrogen content; Some of them are mixed with wheat bran, peanut hull powder, rice hull powder, sawdust, etc. to increase the porosity of fish meal, which makes people feel as loose as fish meal. Some of them do not produce fish meal, but mix imported fish meal with domestic fish meal, and use recycled imported fish meal packaging bags to sell imported fish meal, Because of the overflow of fake fish meal, farmers have to learn to identify the false to protect their own interests. Most farmers do not have the equipment to detect the quality of fish meal. This paper introduces a simple identification method for reference