1. Fresh-keeping bag: Boil salted duck eggs and put them in a fresh-keeping bag while they are hot, so that they can be kept for about 20 days, even in hot summer. Just pay attention to cooking them before eating next time.

2. Refrigerator storage: Put the salted duck eggs in the refrigerator. If it is 0-2 degrees, it can be stored for about 2 months.

3. Salt water preservation: After the salted duck eggs are cooked, wipe off the water on the surface, and then store them in saturated salt water. Keep it in a cool and ventilated place to prevent bacteria from growing and not increase the salt content of salted duck eggs. This method can be preserved for about 2 months. In the process of preservation, we should pay attention to the change of salt water and do it in time, otherwise it will deteriorate.

4. Vacuum preservation: vacuum the duck eggs after they are cooked. This method is the best, it can be stored for a longer time, but it needs special processing plants or special instruments to operate.