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With AI's integration in education, teachers' AI-TPACK has become crucial for effective technology application. Teachers' professional confidence in AI practice affects technology effectiveness and serves as psychological foundation for continuous professional development. Based on social cognitive theory, this study explores how teachers' AI-TPACK impacts self-efficacy through a cross-sectional survey of 371 K-12 and pre-service teachers in China. Key findings: (1) Teachers' AI-TPACK shows significant group differences, with grade levels presenting a stepwise distribution of "secondary > elementary > pre-service teachers", and teachers in information technology, English, and art subjects performing outstandingly, female teachers excel in AI-EAK; (2) Overall AI-TPACK significantly predicts teacher self-efficacy, with AI-TK, AI-TPK, and AI-TCK having the strongest impact, while AI-EAK shows the weakest influence.