Seedless f1 hybrid watermelon seed SXW No.6 is a new triploid seedless watermelon with resistance to Fusarium, wilt disease and humidity. The whole growth period is about 100 days and fruit development period is about 30 day s. Growing vigorous and setting fruit easily. Average fruit weighs about 8kg and the biggest one can reach more than 25kg of grafting cultivation in greenhouse. The fruit is round with green rind with narrow stripes. Flesh is red with small seed trace, fine texture, crisp and sweet. The central soluble solids content is about 13%. Good adaptability and suitable for long distance shipping. It is suitable for cultivation in open field and greenhouse.