This research was aimed at finding out the students vocabulary learning strategies, the most dominant strategy used by the students, and knowing whether or not there was a correlation between students’ vocabulary learning strategies and their vocabulary knowledge. This research was descriptive study, the population of the researcher was the fifth semester students of English Department of Muhammadiyah University of Purwokerto in Academic year 2015/2016 and the number of population was 130 students. In this research the population was taken 25% or 32 respondents, and the technique of sampling used purposive sampling. In collecting data the researcher used a questionnaire as an instrument which consisted 25 items adopted from Schmitt’s (1997) taxonomy of vocabulary learning strategies. The researcher analyzed the data by using percentage to decide the strategies in learning vocabulary most frequently used by respondents. The results of the research finding were: determination strategies (55.37%), social strategies (56%), metacognitive strategies (54.62%), memory strategies (57.75%), and cognitive strategies (52%). The score result indicated that the use of memory strategy was the most used by the fifth semester students of English Department of Muhammadiyah University of Purwokerto in Academic year 2015/2016. The students like to practice and repeat new words. It means that when the students get a new vocabulary they practice it continuously. The researcher found that there was a negative correlation between students’ vocabulary learning strategies and their vocabulary knowledge. It can be seen from the result of computation of the correlation analysis where the r-obtained was -1.91. In conclusion, there was a negative correlation between students’ vocabulary learning strategies and their vocabulary knowledge.