Agriculture is not only an important sector of the national economy, but also an important carbon-source and carbon-sink. As a carbon-sink, agriculture has the ability to compensate for the inevitable carbon emissions of itself and other sectors. The core of low-carbon agriculture is to promote the overall green transformation of agricultural development. Promoting and expanding the practices of low-carbon agriculture is the best ways to achieve the reduction goal of carbon-emission, and deal with the climate crisis. This paper focuses on the analysis of low-carbon agriculture related actions of the EU, the United States and Japan from the dimensions of action background, development objectives and technology paths, as well as relevant support systems and expected effects. It is found that the low-carbon agriculture related actions have strong inheritance in these developed countries: 1)the EU mainly advocates nature based solutions to promote the realization of various green goals in Europe by decoupling economic growth from resource consumption; 2)the United States focuses on building climate-smart agroforestry, while meeting there quirements of improving productivity, enhancing the ability of agriculture to cope with climate change and reducin genvironmental load; 3)Japan emphasizes the decarbonization of agricultural through digital, smart, biological and other technological innovation, while at the same time improve and ensure Japan's food self-sufficiency ratio and domestic production rates. Among them, the EU mainly through restricting the use of certain agricultural inputs, expanding the area of organic farming and other measures to achieve development goals; the United States achieves the development goals mainly by technological innovation; and Japan combines the technical characteristics of the EU and the United States. The core of low-carbon agriculture in the above three economies is to strengthen the management of agricultural green house gas emission and storage through perfect policy support system, appropriate operation and management mode and advanced emission reduction and carbon fixation technology. There is still a big gap between China and countries with high level of low-carbon agriculture, including slow progress in the development of new plants and animals varieties for adaptation and mitigation of climate change, insufficient substitution of clean energy for agricultural production, and continued high greenhouse gas emissions caused by food loss and waste. China should strengthen its planning and layout in such areas as policy planning, scientific and technological support and international cooperation, so as to build China's low-carbon agricultural industry as early as possible and help China achieve its goal of carbon peak and carbon neutrality.