The invention relates to a perpetual flower forcing method for butterfly orchid. A flower forcing greenhouse is processed, butterfly orchid flower forcing seedlings are processed, first-time flower forcing fertilization is performed, pedicels are selected, plants with abnormally-developed flowers and excessively-opened flowers are rejuvenated, second-time flower forcing processing is performed, and second-time flower forcing of butterfly orchid is completed. Flower bud differentiation of the butterfly orchid can be well facilitated, the flower forcing pedicel obtaining rate is high, the number of flowers on the single plant is large after flowering, the flower color is gorgeous, the butterfly orchid can achieve perpetual blooming in the market, and the problems that the pedicel obtaining rate is low, the uniformity is poor, the batch flower appearing time is hard to master and the flower development is normal and not stable during butterfly orchid production are solved. In addition, the quality of potted butterfly orchid is improved, second-time flower forcing processing is combined, and economic benefits are improved. Compared with a traditional flower forcing technology, the flower forcing pedicel obtaining rate reaches 95% or above and is increased by 10-15%; the number of flowers on single plant after flowering is 10-15 and is increased by 2-3, and economic benefits are improved by 15-20%.