Social media platforms like TikTok offer new opportunities for students to enhance their English vocabulary. This study aims to explore and describe students’ experience of using TikTok to acquiring new vocabulary. The participants in this study were junior high and high school students who actively used TikTok to learn English. A total of 35 students participated by filling out questionnaires, and several were interviewed. The writer employed a purposive sampling technique to select participants. This research used a qualitative case study method, collecting data through questionnaires, interviews, and vocabulary tests. The results indicate the students have a generally positive experience of using TikTok for vocabulary learning. They found it enjoyable, easy to access, and engaging, which motivated them to learn more. TikTok also helps students discover new vocabulary informally, but there are challenges such as difficulty in understanding certain accents and occasional technical issues like app lagging. Despite these challenges, TikTok was found to be a valuable supplementary tool for vocabulary learning, contributing to students’ overall language development.