This study aims to develop diagnostic science literacy in elementary school students. In the first semester of 2018, 30 students in grade VI made up the sample group. which is an instrument in developing the quality of scientific literacy diagnostic tests developed through the analysis of PISA results. There are three components, namely knowledge, context, and attitude. Multiple choice questions, analysis of data based on the level of a construct's dependability, discrimination, and difficulty validity by validating factor analysis as a feature of the diagnostic test. The conclusion of the study shows that the diagnostic test is a viable solution for assessing scientific literacy because it is based on real data. The sample group was shown to have misconceptions about what, in context, constitutes scientific literacy.