In evangelizing we need to pay attention to who we will evangelize, what factors influence, such as mindset, culture, how their habits and characters are. Today evangelism has its own challenges on how to evangelize the generation of children who live in the era of the industrial revolution 4.0 and 5.0 with all the increasingly sophisticated technological developments. If the methods and ways of evangelism used still use traditional forms, then the current generation of children will not understand the salvation carried out by evangelists. This research uses a qualitative description approach by examining library sources. This research aims to find the urgency of finding the principles of effective evangelism to children, namely the doctrine of the Bible and salvation must still be the main part for children, creativity and integrity of the evangelist. While the content principles of effective evangelism that are relevant to children in the digital age are following Jesus is the best "attachment" commitment, Jesus must be known through intimacy, experience, not mere knowledge, binding friendship with Jesus is the best decision.