The embodiment of the invention provides an invisible orthodontic method and system for a tooth. The method comprises the following steps of: obtaining a dentition model in a current correcting stage; obtaining an invisible corrector in the current correcting stage according to the dentition model in the current correcting stage; measuring the correcting force of an invisible corrector on a target tooth; judging whether the invisible corrector is replaced or not according to the correcting force; after determining that the invisible corrector is replaced, obtaining a three-dimensional model of a corrected tooth jaw and overlying and comparing the three-dimensional model of the corrected tooth jaw with the corrected target dentition model; if the two are fully overlapped, finishing invisible orthodontic treatment on the target tooth; otherwise, determining the invisible corrector in the next correcting stage, and performing invisible orthodontic treatment on the target tooth through the invisible corrector in the next correcting stage till the invisible orthodontic treatment of the target tooth is finished. According to the embodiment of the invention, the tooth correcting effect and precision are enhanced, the correcting period is shortened and the correcting cost is lowered, and meanwhile, the utilization ratio of the invisible corrector is increased.