Freezing at low temperature or scalding at high temperature, then washing the shrimp with clear water, cutting off the long beard and sharp corners of the shrimp with scissors, picking out the part of the head connected with the body tissue with a toothpick, inserting the toothpick near the tail, removing the epidermis, then slowly picking out the shrimp line with the toothpick, and finally washing it with clear water.