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The competency to think critically is one of the skills that students must possess in the 21st century. This study aims to determine vocational students' critical thinking skills (CTs) in digital simulation and communication subjects using expository based on digital learning repository. This research uses quantitative descriptive. The samples of this study were students of class X SMK N 2 Surakarta. The instrument used is a multiple-choice test that developed based on indicators of CTs, according to Facione, which consist of interpretation, analysis, evaluation, inference, explanation, and self-regulation. The results of this study showed that the average percentage of students' CTs is in the sufficient category. The results of each indicator can be described as follows: (1) The interpretation indicator is 46.8% in the sufficient category, (2) The analysis indicator is 49.5% in the sufficient category, (3) The evaluation indicator is 60.5% in the sufficient category, (4) The inference indicator is 48, 4% in the sufficient category, (5) About 56.5% for the explanation indicator in the sufficient category, and (6) The self-regulation indicator is 64.5% in the high category. The results showed that students' CTs were still quite or moderate. Students' CTs need to be improved with innovative learning models and methods that will affect learning motivation and critical thinking skills towards various student problems in teaching and learning activities. [ABSTRACT FROM AUTHOR]