Based on the characteristics of offshore wind farms and the practical cases, an applicable design scheme of automatic fire alarm system is introduced, which includes the selection and setting of fire detectors, linkage control of associated fire protection systems, arrangement of fire telephones, system power supply and wiring, etc. In addition to its compliance with the requirements for unattended operation and land⁃based remote monitoring of the offshore wind farm, the design can also ensure the stability and reliability of the system, so as to guarantee the safe operation of the offshore wind farm.