The invention discloses a greenhouse cultivation method for promoting high quality and high yield of the dragon fruit. The method includes steps of construction of greenhouse heat-preserving facility, soil preparation and bed making, frame erecting and modeling, planting, water and fertilizer management, shaping and trimming, artificial pollination, blossom and fruit thinning, pest control and the like. In addition, the invention further discloses a greenhouse structure and a dragon fruit frame building structure. The greenhouse cultivation method and the greenhouse structure for promoting high quality and high yield of the dragon fruit solves problems of high cost, low yield, poor quality and the like in conventional greenhouse cultivation technologies of the dragon fruit, cultivation of the dragon fruit is simplified, production cost is lowered, and the dragon fruit yielded is high in yield, is truly green and healthful fruit and has nutrient value obviously higher than that of the dragon fruit cultivated by conventional methods.