This paper proposes a new strategy for youth physical education from the role mechanism of each influencing factor of youth sports interest. By introducing the interest theory, a theoretical framework of the interest generation mechanism of the physical education classroom situation is constructed. The research hypothesis of adolescent sports interest is proposed. Synthesize the results of correlation analysis and regression analysis to construct a structural equation model of interest generating factors in adolescent physical education classroom. The model takes the psychological, institutional and physical environments of sports as the antecedent variables, the stimulation of interest in sports learning situations as the mediating variable, and the retention of interest in sports learning situations as the outcome variable. Through the structural equation path test to get the role mechanism of each influencing factor, combined with the components of youth sports literacy and the sports literacy goal system, the new strategy of youth sports education under the integration of physical education is proposed. We analyze the role of the new strategy of physical education on the stimulation and retention phases of adolescents’ interest in physical education contexts. Simple effects analyses showed a nonsignificant main effect for the pre-experimental group and a significant main effect for the post-experimental group in the phase of interest arousal and maintenance in the sports situation. In the stage of sports interest stimulation, the experimental group was significant before and after the intervention, 3.15 vs. 5.63, p0.05).