2018 was a year when the situation on the Korean Peninsula shook hands and turned the corner.The situation on the Korean Peninsula has turned round, but there are also new challenges.The issue of the UN Security Council sanctions against the DPRK has attracted more and more attention from the international community, and the DPRK's dissatisfaction with the UN Security Council sanctions is becoming more and more serious.In terms of the effect of sanctions, although the sanctions of the UN Security Council have dealt a serious blow to the DPRK economy, they have not achieved the purpose of forcing the DPRK to give up nuclear weapons, which inevitably makes everyone doubt whether sanctions against the DPRK are necessary and reasonable.At present, the denuclearization of the Korean Peninsula has reached a critical moment. The DPRK has proposed some conditions for the exchange of “abandonment of the nuclear”, including the UN Security Council’s gradual withdrawal of sanctions against the DPRK. However, the UN Security Council still insists on sanctions against the DPRK, and as the sanctions have prolonged, some negative factors of sanctions have gradually emerged. The UN Security Council’s sanctions resolution against the DPRK has some defects, such as the use of sanctions is influenced by political factors, the content of sanctions indirectly conflicts with the humanitarian principle, etc. In such circumstances, the UN needs to pace itself and actively bring into play its leading role in the complicated conflicts of interest, in order to gain more room for action. First, the UN should actively create conditions for the DPRK’s return to the NPT. Second, the UN should actively promote the signing of the “Peace Agreement” on the Korean Peninsula.