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Mathematical communication skills are one of the essential mathematical basic competencies of mathematics and mathematics education. Without good communication, the development of mathematics will be hampered. The purpose of this study was to determine the mathematical communication skills of high school students in solving trigonometry problems. This study also wants to reveal the difficult aspects of mathematical communication for high school students. The research design used was descriptive qualitative research involving students of class X MIPA 1 as research subjects. 36 students were taken as representatives from 3 groups, namely 12 high group subjects, 12 moderate group subjects, and 12 low group subjects. The instrument used in this study is a test of mathematical communication skills in the form of a description. Based on the research, the average mathematical communication skills of students in the upper group subjects, medium groups, and low groups are in the less category. The results showed that students ability to solve trigonometry problems with mathematical communication had not been achieved. Based on the results of the study it was found that students had difficulty resolving mathematical problems presented in the form of images. Students have difficulty expressing the mathematical concepts used.