This study aims to explain the representations of students’ engagement in project-based learning and to explain the impact of students’ engagement in project-based learning on their 21st century skills. This study used qualitative methods and descriptive research design. Data collection method are observation, interviews and documentation. This study used data reduction, data display, and drawing conclusions as method of analysing data. The participants in this study were class VIIIA students at Madrasah Tsanawiyah Negeri 02 Jepara. The results showed that the majority of students were actively involved in the behavioral, emotional, social and cognitive in project-based learning. In addition, engaging students in Project-based learning can help students develop their 21st century skills, in terms of developing critical thinking skills and problem solving, creativity skills, cooperation skills, and communication skills. Project based learning is recommended for teaching English. Project-based learning offers students the opportunity to engage in behavioral, emotional, and cognitive and developing students 21st century skills.