The main objective of this study was to develop learning ethnomathematics learning device based on Realistic Mathematics Education models on skill mastery in mathematics learning activities. The quasi-experimental technique was done by matching the pre-test and post-test control group. The study involves the State Elementary School (SDN) of Bengkulu city cluster 14 of class 4 as the population. Cluster random sampling is the technique applied to determine the sampling so that the study took class 4 at SDN 52 Bengkulu City as an experimental group and class 4 at SDN 24 as the control group. A test comprising of five questions in the form of description was the instrument used in this study. The test was given two times; before and after the learning activities in the experimental and control classes. The results of the t-test on students' post-test showed tcount = 3.19, and ttable = 2.04. Hence, tcount > ttable indicated that there were differences in post-test results between the experimental and control class. It can be concluded that there is a significant influence on the use of ethnomathematics-based realistic mathematics models on literacy abilities in mathematics learning activities of the 4th grade at SDN XIV in Bengkulu city.