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Abstract This study aims to improve the ability of reflective thinking through collaborative problem solving based on thermodynamic learning. The method used is descriptive quantitative analysis, a sample of 16 prospective physics teacher students who are following thermodynamic learning. The instrument used in this study uses a modified Kember reflective level level scale. This research was conducted for 3 meetings but began by holding a pre-test to see the improvement of students reflective thinking skills from the beginning to the 3rd meeting, the learning model used was collaborative problem solving. The results showed that reflective thinking ability increased at Reflection and Critical Reflection levels while in habitual action and understanding did not increase. This shows that through the application of collaborative problem solving models in thermodynamic learning can improve the ability of reflective thinking students of physics teacher candidates on high-level thinking