There is a good way to keep watermelons fresh for two months.

1. Indoor storage method. Choose a cool and clean ordinary empty room or cellar as the storage room. Before storage, disinfect the ground with 150-200x formalin solution, then cover with dried straw, leave 10cm vines to pick watermelons, soak them in 10-15% salt water for 3-5 minutes, and place them in the direction of the watermelon field, one layer of hay and one layer of melons, leaving ventilation to facilitate inspection, ventilation and cooling at night, and appropriate watering. 2. Salt water sealing method. Soak the watermelon in 5-10% salt water for 2-4 hours, then smear the surface of the watermelon with 0.5-1% potassium sorbate or sorbic acid, wrap it in plastic wrap or polyethylene bag and store it at low temperature. 3. The fresh-keeping method of melon vine juice. Watermelon vines contain substances that inhibit the respiration of watermelons during ripening. Grind the fresh melon vine into pulp, filter and extract juice, dilute it into 300 times liquid spray watermelon surface, dry it to form a thin film, and store it in a cool place. 4. Fine sand burial method. Choose a clean, ventilated and cool place, spread 60mm clean fine sand, pick melons in the early morning on a sunny day, leave 3-4 leaves, put a layer on the sand, cover with fine sand 50mm, leave melon leaves outside the sand to make nutrients, and spray carbendazim solution to sterilize the sand pile. The above methods can be kept fresh for 1 to 2 months, watermelons can not be too mature, it is better to pick 80-90% ripe watermelons.