This study aims to know the process and result of the lesson toimprove cognitive development through fishing games for group B children ofkindergarten Miftahul Huda Cilacap District.This research was a kind of classroom action research.This study used the Kemmis and Taggart’s design.Each cycle consists of four phases: planning, action, observation, and reflection. The research subjects are group B children of Kindergarten Miftahul Huda. The data collection techniques included observation, interviews, and documentation study. The collected data were analyzed using descriptive qualitative and quantitative methods. The results of the study show that the cognitive development of child before the action is still in the category of beginning to developing, that is 58,55%; the results first cycle reaches69,62% in the category of developing and the second cyclereaches 80,99% in a category of highly developed; the use of fishing games has a very good impact on cognitive development shown by the cognitive development of the children, which is higher after the action compared to that before the action.