Holding the shrimp in one hand and gently picking the shrimp line with a toothpick in the other will pick it out. The result of picking is that the shrimp line near the head of the shrimp will be picked out first.
Slowly pull the shrimp line by hand, and the end of the shrimp line near the tail will all be pulled out.
There is an ultra-sharp thorn in the middle of the top of the shrimp head. Be sure to cut it off, or you will stab your hand or mouth.
Cut the joint between the shrimp head and the shrimp body with scissors, turn down the water pipe and wash the black tissue on the head with a toothpick. Some internal organs are concentrated here, and there are sandbags, which are also dirty parts.
Compare the untreated shrimp, cut off the long whiskers, spines and feet of the shrimp, pick the shrimp line and clean the internal organs of the head.