The invention discloses a coastal defense command and control system and method. The coastal defense command and control system comprises a battalion level fixed command post, a battalion level command car, a company level command car, a comprehensive security company, detection equipment and fighting equipment. In peacetime, all kinds of combat units are commanded by the battalion level fixed command post, and the battalion level command car is taken as backup; in wartime, all kinds of combat units are commanded by the battalion level command car; the battalion level fixed command post, the battalion level command car and the company level command vehicle are provided with primary servers and standby servers; a server cluster adopts primary and standby and master and slave architectures;the primary servers are accessed under normal circumstances, when the primary servers fail, the standby servers are started, and the battalion and company command cars constitute master and slave servers, and when the battalion level command car fails, any company level command car can be switched to the battalion level command car. The coastal defense command and control method includes the stepsof data access, data fusion, target threat judgment, alarm information processing and distribution, fire planning, combat order formulation and distribution and strike effect evaluation.