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The port logistics finance has been developed rapidly under the port low-carbon transition development. It was very urgent for research on port logistics pledge loan portfolio optimization decision-making theory under the low-carbon transition. In this study, the port pledge loan under the low-carbon transition theory was set up, which including the principle of pledge loan options, low-carbon, the pledge risk and credit risk control. On this basis, the port logistics pledge loan portfolio under the low-carbon transition optimization model was built up, with pledge loan put option portfolio return, ports and customers, low-carbon structure constraint, single loan VaR pledge rate, pledge loan portfolio average credit risk control conditions. The model solved the drawbacks of existing research focused single port pledge loan and neglecting the pledge loan portfolio under low-carbon transition constraints, etc. [ABSTRACT FROM AUTHOR]