Offshore wind turbine fault detection system

The invention discloses a fault detection system for an offshore wind turbine. The fault detection system comprises a monitoring end, transmission equipment and a control end, the monitoring end is used for monitoring the running state of the wind driven generator in real time to obtain monitoring data; the monitoring data is transmitted to the control end; the control end is used for carrying out operation based on the monitoring data to obtain an operation result, and carrying out fault detection on the wind driven generator based on the operation result; and the transmission equipment is used for information interaction between the monitoring end and the control end. According to the method, the blades, the transmission shaft and the generator in the offshore wind turbine are monitored in real time by reasonably arranging the sensors, the operation state of the offshore wind turbine is obtained by processing, calculating and analyzing monitored data, and faults are predicted based on the operation state of