Blockchain technology resolves the bottleneck of traditional centralized data storage technology. It can better facilitate the seamless operation and supervision of port cold chain logistics and can meet the massive business demand for cold chain imports and the surging demand for pandemic prevention and control. However, it is a challenging task to incentivize cold chain enterprises in the maritime industry to adopt blockchain technology and actively participate in information sharing platform. Using evolutionary game theory, through an analysis of evolutionary stability strategies, this paper explores the evolutionary path of port cold chain logistics enterprises that participate in information sharing. An incentive mechanism based on blockchain smart contract is designed to encourage cold chain logistics enterprises to actively participate in information sharing within chains. Smart contracts can continuously encourage enterprises to participate in information sharing by timely adjusting the incentive participation costs of participating enterprises.