To address the issues of vague accounting boundaries and imperfect methods in the carbon footprint accounting of precast concrete products for port engineering,we propose an evaluation method suitable for the carbon footprint throughout the entire life cycle of precast components,from raw material production to waste disposal,clarify the accounting approach,scope and content,and build a calculation model.Taking a pre-stressed square pile with 700 mm side length of cross-section as the accounting object,we calculate the carbon footprint per unit product to be 18,446.12 kgCO2eq.Among them,the carbon footprint in the raw material production and transportation stage accounts for the highest proportion in the life cycle,reaching 82.2%,which mainly comes from the production process of cement and steel;the carbon footprint in the production stage is relatively low,accounting for 1.70%,mainly concentrated in energy-consuming links such as mixing and curing.The results provide an accounting method reference and quantitative basis for the refined management of carbon emissions from precast concrete components in port engineering,can offer data reference for practitioners in the water transportation field to estimate the carbon emission level during the construction stage of port engineering,and provide methods and references for carrying out the formulation of relevant carbon footprint codes.