Anxiety becomes the most common class of mental disorder present in the world, including Indonesia. One of the things that could cause anxiety was National Examination. The anxiety arised because there was a lot of subject to be learned and students were afraid the exam result were not satisfactory. Excessive anxiety could interfere physical, cognitive, emotional, and behavioral. Anxiety could be treated with pharmacological and non-pharmacological therapy. One of non-pharmacological therapy was wudu’ therapy. Wudu’ had the same principles with hydrotherapy in the treatment of anxiety; besides, it also had worship value for the people who did this therapy. The purpose of this study to determine the effect of wudu’ towards anxiety level of Senior High School students in National Examination. This study was an quasy experiment with pre-post test with control group design. Sample of this study were 70 respondents that had been chosen by accidental sampling. This study used S-AI (State-Anxiety Inventory) instrument to measure anxiety level. The data would analyze with statistical test of T-Test. Paired t-test results showed p value=0,000 (p<0,05) in intervention group and p=0,948 (p>0,05) in control group, it means that there were significant difference in intervention group before and after wudu’. In conclusion, wudu’ therapy affect the level of anxiety of Senior High School students in National Examination