Smartphones as a product of industrial technology 4.0 are equipped with various multimedia applications that support human needs using the internet as its main access. Various smartphone functions have a negative impact such as problematic internet use (PIU) when used improperly. This problem also arises in Early Childhood Education (ECE). Through the Parent Training Program, we collaborate with ECE to prevent the impact of problematic internet use on parents of ECE students. One group pretest-posttest design with one pretest and one posttest were used to determine whether there were differences in knowledge scores about the internet and the positive and negative impacts of the internet before and after training. Based on the results of different tests with the Wilcoxon sign rank test formula, Wilcoxon test results show Z = -3.277 with a level (sig (2-tailed) = 0.001 less than α 5%, which means that at the 95% confidence level there was a significant difference in the pretest and posttest scores. This shows that there was a very significant difference between scores of knowledges about the internet and the positive and negative impacts of the internet before and after the training. Thus, it can be concluded that the Parent Training Program with methods of providing information, role play, ice breaking, and games related to the negative impact of internet use was effective in an effort to reduce the risks that arise due to problematic internet use.