The research has purpose to identify the students reading comprehension level, students vocabulary knowledge and find the correlation in between students reading comprehension level and students vocabulary knowledge. This research setting was with English Language Education Department (ELED) of Private University in Yogyakarta (PUY). Researcher used quantitative method and correlational design in collecting the data of this research. In this research, researcher involved students’ of ELED of PUY batch 2016. The total population was 94 students and then in this research involved research sample is minimal 73 students and researcher get 80 students for sample in this research. Then, the research used instrument namely vocabulary test to find out the grade for vocabulary knowledge. Students’ reading comprehension level was measured using TOEFL test in reading section. The research found out that the ELED of PUY students’ batch 2016 had low intermediate for reading comprehension level. It was supported by the students reading mean value of 43,8. The research also found out that the vocabulary knowledge of ELED of PUY batch 2016 was in intermediate category because the mean value of vocabulary knowledge was 6865. The last result showed that the correlation between students’ reading comprehension level and vocabulary knowledge is in moderate category of correlation. It means that the correlation was positive but not significant with the correlation value was 0.545.