This research aims to identify the causes of errors made by students in Translating English Collocation. The design of this study uses mixed methods, there are qualitative and quantitative methods. Also, this study used random sampling as a technique to find suitable participants for this research. Respondents were 30
Stundents English Department. The research data were collected using questionnaire techniques and semi-structured interviews. The data will collected by the participants, making it possible to ask further information as well as follow-up questions. The findings show that students are successful in acquiring students' English vocabulary by using English Collocation. These strategies are active reading strategies, grammar translation methods, cooperative learning methods and learning media. In addition, the reason for differences in vocabulary acquisition is because teachers usually use strategies to improve students' skills in translating English texts or vocabulary in various ways. However, students still experience difficulties in their pronunciation, practice, and imitation.