In recent years, marine oil spill is frequent and seriously threats to the sustainable development of coastal areas and marine environment. Large Marine oil spill is difficult to clean up and pollution range is large, lasting for a long time, for the biological and ecological environment destruction, particularly serious. It is very important to take corresponding measures that how to quickly master the location of the oil spill when this event occurs. Satellite remote sensing has advantages of large, multi-temporal, all-weather, real-time, quick and economic and has become an important means of monitoring marine oil spill, playing an important role in the monitoring of marine oil spill treatment. This paper illustrates by Penglai 19-3 oil spill accident, using MODIS remote sensing data, the use of the Robert operator, Sobel operator, Laplacian operator and LOG operator to extract the oil spill edge, and extraction accuracy of the comparison and analysis.