The cleaning method of pig's large intestine is to clean the inner layer, add flour, knead pig's belly and add salt.

1. Cut a small hole in the pork belly, turn out the inner layer, and scrape off the residue on the inner layer with a knife.

2. Add flour to the pot of pig's large intestine. Flour can neutralize the gastric juice in the pig's stomach and remove the fishy smell.

3. Keep rubbing the pork belly covered with flour, open the pork belly, put the folded part in, and pour in water.

4. Rub the salt on the pork belly, both sides, and finally let it stand for 5 minutes.