Using international corn trade data in 2019, 2021, and 2022, through matrix construction and algorithm design for data mapping, this paper explores the changes of the global corn shipping pattern under the background of COVID-19 pandemic and Russia-Ukraine Conflict. It is found that the Pan-Mediterranean Sea, the northwest Pacific coast area and the Caribbean Sea are the three cores of the world’s corn shipping. The epidemic and Russia-Ukraine conflict have a limited impact on the world corn shipping structure, and local changes are greater than the overall changes. The impact of Russia-Ukraine conflict on the world corn shipping pattern is concentrated in the Pan-Mediterranean region. The quantitative changes in the evolution of corn shipping pattern are still accumulating. Both the epidemic and Russia-Ukraine conflict have a dual effect in the volume of corn and freight rates. The Russia-Ukraine conflict interfers with the rebound of corn shipping in the world’s waterways after the easing of the epidemic. Considering the rising unit price of global shipping corn, the economic value of the Black Sea-related waterway has decreased significantly, and the economic value of waterway from South America around the Cape of Good Hope to East Asia and Southeast Asia shows a positive growth trend. The Pan-Mediterranean waterway is of highly comprehensive value. The western coastline of the African continent has low economic value but high international service value.