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This study explores the influence of teacher's extracurricular time input on teaching quality. Based on the data of TALIS 2018, we constructed a fixed effect model and found that: First, teachers from different countries take an average of 26.5 hours per week for extracurricular work. Second, there is an inverted U-shaped relationship between teacher's extracurricular time input and teaching quality. But different types of extracurricular time have different effects, teaching and preparation time, professional development time are all in a positive linear relationship with teaching quality, while administration and management time is in an inverted U-shaped relationship with teaching quality. Third, teaching experience plays a negative moderating role in the influence of extracurricular time input on teaching quality.