The invention discloses a method for increasing the fruit set percentage of a fruit tree. The method comprises the following steps: step one, preparation before implementation; step two, preparation of a solution; and step three, field spraying. According to the technical scheme, food of pollinating insects can be increased effective, so that the number of the pollinating insects is increased; and moreover, the humidity and the sugar content of flower stigmas can be increased, the moisturizing time of the flower stigmas is prolonged, the pollinating insects and attracted and used for pollinating for fruits and vegetables, the pollinating probability is increased, the fruit set percentage is increased, and the production cost is reduced. The method has important meaning on high quality and high yield of the fruit tree.