The invention provides a method for secondary high-quality fruiting of summer black grapes in a scant sunshine area. The method comprises the following steps that (1) the summer black grapes are taken, and buds are coated with 2.0-2.5% monocyanamide; (2) sprouting fertilizer is applied; (3) in a branch tip growth period, 15 kg of urea, 2.5 kg of potassium dihydrogen phosphate and 5-8 tons of waterare applied per mu; (4) 4-5 leaves are left at the upper portion of a spica of each fruiting branch, pinching is conducted, buds at the lower portions of the spicae are all removed, 6-7 leaves are left on each vegetative branch, and pinching is conducted; (5) after primary fruits are set stably and new shoots have 50-70-cm semi-lignified parts, 1,500-fold 10% paclobutrazol and 0.2% potassium dihydrogen phosphate are sprayed, 7 days later, spraying is carried out once, and 10 days later, the buds are coated with 2.5% monocyanamide; (6) 25 days after bud coating, the spicae are elongated, and after 80-90% of secondary flowers fall, fruit preservation treatment is conducted. By means of the method, the quality of the grapes obtained by secondary fruiting can be greatly improved, and the economic value of the grapes is increased.