The invention discloses an offshore wind farm auxiliary control system linkage method, comprising the steps of establishing a data model of an auxiliary control device in each auxiliary control subsystem of an offshore wind farm, and acquiring a linkage relationship between the auxiliary control devices; defining, according to the linkage relationship, a linkage alarm type, a linkage alarm mode, alinkage alarm behavior and a linkage alarm operation; acquiring a real-time alarm signal; obtaining a specific linkage operation; performing the linkage operation and verifying the result of the linkage operation. The offshore wind farm auxiliary control system linkage method achieves an interactive communication function of the offshore wind farm auxiliary control system, can conveniently locateaccidents, understand the accident situations in real time, and take effective measures in time to prevent accidents from expanding.