The invention discloses a summer pruning method of grapes. The method comprises the following steps: (1) pruning each bearing branch (1) to preserve a spica; (2) if a fourth leaf above each section on which the grape spica is located is unfolded, pinching the corresponding bearing branch (1); (3), pinching all side branches (2) at the opposite side and the lower section position of the spica; (4) pinching if six leaves are grown on a first lateral branch (3) above the same side of the spica; pruning an upper lateral branch (4) of the first lateral branch (3) to preserve a leaf and pinching; pruning a topmost lateral branch (5) to preserve 2-3 leaves and pinching; keeping a leaf on each of the rest lateral branches respectively and pinching. By adopting the summer pruning method of grapes provided by the invention, the flower bud differentiation quality can be improved, the yield can be improved, the fruit quality can be improved, the advanced manuring of fruits can be promoted, and the disease resistance of trees can be improved.