Ocean exploitation has entered full ocean depth era. However, frequent marine geological disasters seriously restrict its development. Due to the complex marine engineering geology environment, in-situ observation has become an important means of submarine engineering survey. Based on the common types of marine geological disasters in marine engineering activities, this paper introduces the marine engineering geological survey and in-situ monitoring technology and its application from the perspective of marine engineering geological environment and dynamic action, so as to provide new ideas for the study of marine geological disasters in China.