The invention discloses a method for planting watermelons by using functional water. The method comprises the following steps: (1) producing a high-concentration high-acidity functional water
stock solution by using refined salt (NaCl) as an
electrolyte by using multifunctional flowing-water-type
electrolysis equipment (application number of patent: 201510270727.6), and producing a high-concentration high-
alkalinity functional water
stock solution by using
potassium carbonate (K2CO3) as an
electrolyte by using the multifunctional flowing-water-type
electrolysis equipment; (2) one week before watermelon planting, diluting the high-concentration high-acidity functional water
stock solution with
tap water by 5 to 10 times, and then, carrying out soil spray disinfecting treatment once before planting; (3) diluting the high-concentration high-
alkalinity functional water stock solution with
softened water by 30 to 50 times, then, soaking watermelon seeds in the diluted high-concentration high-
alkalinity functional water for 1.5 hours, then, taking out the watermelon seeds,
drying the watermelon seeds in the air, and then, carrying out
seedling raising; (4) 5 to 7 days after the field planting of watermelon seedlings, spraying the diluted high-concentration high-alkalinity functional water to leaves, stems and fruits of the watermelon crops by using atomized spraying equipment; (5) irrigating roots of the watermelon crops by using the diluted high-concentration high-alkalinity functional water; and (6) periodically spraying the leaves, stems and fruits of the watermelons with the diluted high-concentration high-acidity functional water by using the atomized spraying equipment.