Sea urchin is a class under Echinoderm, and it is a kind of invertebrate living in shallow waters of the ocean. It is characterized by a spherical, disc-shaped or heart-shaped body without wrists. Sea urchin is not only a delicious seafood, but also a valuable Chinese herbal medicine. The main nutritional components of sea urchin eggs are lecithin, protein, riboflavin, thiamine and fatty acids. Sea urchin is an ancient creature in the ocean, which is closely related to starfish and sea cucumber. Sea urchins can be made into sashimi, sushi, steamed eggs, sea urchin porridge and other delicacies.