How to preserve crabs after boiling 1: If the weather is cold, the preservation of cooked crabs can be done by just covering them with plastic wrap, which can usually keep them fresh for 6-8 hours. If there is no plastic wrap, then you can put the cooked crabs in a cool and ventilated place, pay attention not to be contaminated by other things. Method 2: When the weather is hotter, the preservation of cooked crabs can be put into the freezer of the refrigerator, but this can only be a short period of time, and you can't let the crabs stay in the refrigerator overnight, because it will lose a lot of nutrients. Method 3: If you want to keep cooked crabs overnight, you can put them in the freezer of the refrigerator, but freeze them together with the crab soup, otherwise, the cooked crabs will lose moisture and dry out, which is very unpalatable, and the fresh flavor of the crabs is also lost. Tips: no matter which way to save cooked crabs, when eaten again, be sure to cook again, and to cook through, otherwise it is easy to upset stomach Oh.