With the change of lifestyle, more and more Chinese post-90s consumers choose to improve their health condition by purchasing health care products. Currently, there is insufficient attention to the role played by this consumer group in the dramatically transformed health care market in China, and most of the studies are superficial, staying at the gaze of ordinary consumers' consumption perspective, lacking profound and specific research on the influence of health anxiety factors in the psychological level, and the conclusions and recommendations drawn are not in-depth enough. This study investigates the behavioral transformation of Chinese post-90s health care consumers based on the Theory of Planned Behavior to provide a reference for the promotion and correction of youth health care behaviors and to supplement the deficiencies of the Theory of Planned Behavior in the emerging health care field. This study used a survey of 215 post-90s consumers, and to ensure the reliability of the scale, descriptive statistics, reliability tests and correlation analysis were conducted using SPSS 26.0. The findings of this experiment can provide guiding suggestions for guiding young consumers to choose health care products correctly and rationally.