In the digital era, all activities related to learning, playing, entertaining, and connecting with friends... can take place in cyberspace. It is impossible to deny the positive values that cyberspace brings to people in the context of today's technological revolution. However, due to insufficient awareness, children accessing cyberspace may face negative influences and factors from this environment. According to UNDP, one of the aspects of human security is that people are protected from abnormal and harmful changes in life, regardless of their environment (Tran Viet Ha, 2020, 23-34). Children are identified as a vulnerable group which needs to be specially protected from cyberspace by specific policies and regulations in order to avoid infringing on their rights and promote their stable development. Based on determining the responsibilities of subjects protecting children in cyberspace according to Vietnamese law, this article will propose some solutions to improve regulations and contribute to protecting children in cyberspace in accordance with Vietnam's practical situation and international legal standards.