Abstract: It has become the primary task for China to respond to climate change and strengthen the construction of ecological civilization to promote the research of low-carbon development and construction, discuss the path to achieve carbon peak, and realize the goal of carbon neutrality on this basis. This study took a large-scale pig farm in Yantai City, Shandong Province as the research object, and analyzed the carbon emission characteristics of all emission sources in the pig breeding process by measuring the CH₄ and N₂O emissions in the pig growing process, manure storage process, N₂O emissions in the manure farmland utilization process, and energy consumption CO₂ emissions. The results showed that the CO₂ equivalent emission from intestinal fermentation of CH₄ was only 6.4% of the total annual greenhouse gas emission, while the exhaled CO₂ emission from pigs accounted for 93.6%. The CO₂ equivalent of N₂O emission during fecal storage only accounted for 15.2% of the total annual greenhouse gas emission during fecal storage, and 17.9% of the CO₂ equivalent emission from CH₄ during fecal storage. The direct emission of N₂O was 10 times of the indirect emission. CO₂ emissions from coal consumption, electricity consumption and oil consumption accounted for 74.5%, 23.8% and 1.7% of total CO₂ emissions from energy consumption, respectively. The average annual greenhouse gas CO₂ equivalent emission of the pig farm was 5.10×10~6 kg, in which pig growth, manure storage, manure utilization and energy consumption accounted for 50.9%, 26.0%, 6.6% and 16.5%, respectively. The growth process of pigs was the main source of greenhouse gas emissions from pig farms. Without considering the exhaled CO₂ emissions of pigs, the greenhouse gas emissions from manure storage were the main factors to determine the level of greenhouse gas emissions from pig farms. In view of this, the authors put forward some suggestions on feeding low crude protein diet, optimizing manure storage mode and changing manure application method.