‘Shannong No.6’ is a new watermelon F1 hybrid developed by crossing inbred line M08 as female parent and inbred line J16 as male parent. It is of medium maturity. It takes about 35 days for fruit development and the whole growth period is about 97 days. It is easy to bear fruits. Its fruit is of oval shape and the fruit shape index is about 1.48. The fruit pericarp is dark green in color and about 1.2 cm in thickness. The fruit is strong and tough，and tolerant to storage and transportation. Its flesh is red in color and very juicy with less fiber. It has excellent taste and flavor. The central sugar content is 12%，value of that is close to the edge sugar content. The single fruit weight is 8 kg. It can yield 67.5 t·hm^-2. In field its resistance to Fusarium wilt is stronger than that of the contrast‘ Xinong No.8’. It is suitable to be cultivated in open fields and facilitated area of Shaanxi Province.