The background of this study is the real facts, namely the low self-efficacy of students. This problem is because the learning process is still dominated by the teacher's role in learning. Besides that, the low ability of students when doing assignments. As a result, it will give a negative impact on students and make student's self-efficacy will be low. The type of research is quantitative research with the research design of Nonequivalent Control Group Design. Based on the results of the data obtained after the homogeneity test calculation showed that the samples have the same variant or homogeneous. Based on the test of the Mann-Whitney U Test, it shows that the Asymp value is obtained. Sig. (2-tailed) 0.000 5 0.05 therefore, it can be concluded that H1 is accepted and H0 is rejected. These results can be concluded that there is an effect of the GPBL learning model on student's self-efficacy.