Employing the life cycle methodology to compute provincial carbon emissions from swine spanning from 2007 to 2020， we methodically investigated the ramifications and mechanisms of scale development in the swine industry on carbon emissions. Our inquiry revealed that carbon emissions from swine manifest significant spillover effects and aggregation effects， signifying a close correlation between carbon emissions from swine within a given area and those in the neighboring regions. Additionally， the scale development of the swine industry demonstrates a pronounced “inverted U-shaped” association with carbon emissions from swine， denoting a substantial threshold impact of scale development on carbon emissions from swine. When the scale rate of the swine industry remains at 45.1% or above， scale development can effectively facilitate the reduction of carbon emissions within the industry. Moreover， there is a significant monotonically increasing relationship between the proportion of small-scale swine farming and carbon emissions from swine， whereas the proportion of medium and large-scale swine farming exhibit a notable inverted U-shaped relationship with carbon emissions from swine. Finally， aggregation effects and technological advancements serve as the primary conduits through which the scale development of the swine industry influences carbon emissions from swine. It is advisable to meticulously design the spatial arrangement of the swine industry， develop moderate-scale farming， capitalize on technological advancements to instigate change， and judiciously attain the mutually beneficial objective of mitigating carbon emissions while fostering scale development in the swine industry.