Brexit is a big event for European integration and world politics as well. The international community paid a lot of attention to UK’s post-Brexit climate policy because UK is a key player in global climate governance. There have been both continuity and changes in UK’s climate policy since the Brexit referendum in 2016. The continuity is that climate policy is still high on the domestic and foreign agendas of UK government as before. The major changes are：No.1，institutional adjustment，which means UK’s Department of Energy and Climate Change and Department of Business，Innovation and Skills were amalgamated into Department for Business，Energy and Industrial Strategy with an aim to mainstream climate change issue into UK’s energy and industry strategies. No.2，legislation advance. The amended UK’s Climate Change Act came into force in 2019 to officially set a target of near zero emissions of greenhouse gases by 2050 in UK. No.3，international climate policy adjustment. UK made more efforts to strengthen international climate cooperation，including hosting the 26th UN Climate Change Conference （UNFCCC COP 26），to improve UK’s international image as a big power in the world. However，many uncertainties are confronting UK’s post-Brexit climate policy，including the ongoing transitional negotiation between UK and European Union and the outbreak of COVID-19 pandemic. Looking into the future，UK will continue to pursue domestic low carbon development and more actively engage in international climate cooperation despite some uncertainties ahead because this is good for UK’s core national interests.