The invention discloses a method for recycling water-containing 
sump oil by utilizing a delayed coking device. The method comprises the following steps: (1) injecting water-containing 
sump oil into a steam blowing exhausting pipeline of a 
coke chamber when the 
coke chamber of the delayed coking device is subjected to large steam blowing and 
coke cooling process, wherein the water-containing 
sump oil is heated by high-temperature oil gas from the coke chamber; (2) gasifying water and light oil fractions in the water-containing sump oil, mixing the gasified water and light oil fractions with cooled oil, oil gas and steam from the coke chamber, and allowing the mixed oil gas to enter an emptying 
tower; and (3) distilling off the steam and light oil fractions from the top of the emptying 
tower, condensing, cooling, allowing the steam and light oil fractions to enter a liquid separation tank on the top of the emptying 
tower, and separating non-condensable gas, light sump oil and 
sulfur-containing 
sewage from the liquid separation tank, wherein heavy oil fractions are extracted from the bottom of the emptying tower. According to the method disclosed by the invention, the water-containing sump oil which is difficultly treated in an 
oil refinery is treated, the 
cooling load and 
energy consumption of the coking device are reduced, and the method is not influenced by the properties of the water-containing sump oil. The 
energy conservation and emission reduction in a 
refinery plant are promoted, and a certain 
economic benefits are created for the 
refinery plant.