The invention belongs to the technical field of plant cultivation, and particularly belongs to the technical field of cultivation of marriage yarn bracketplants. The invention relates to a method for promoting blooming for a marriage yarn bracketplant. The method is characterized in that the marriage yarn bracketplants are planted in different seasons, after growing for 7 to 8 months, the marriage yarn bracketplants bloom out of season, the drier potting soil is retained, the watering is carried out when more than two thirds of the potting soil is dry, 1.0-1.5 g/L of potassium dihydrogen phosphate is irrigated for once every 10 to 12 days, lasting for 2 months, and white small flowers continuously bloom. By using the method for promoting blooming, the white small flowers continuously bloom after two months of treatment from beginning, the highest flowering rate of the plants is up to more than 98.1 percent, and the problem of off-season blooming is solved.