The invention discloses an ocean wind direction detection device. The device comprises a wind indicator, a wind direction compass, a wind direction pointer, a rotating screw, wind cups, a protective ring, a transmission connecting rod, a wind power sensor, an LED display screen, a buzzer, a compass, a switch, a battery bin and a telescopic screw. The wind direction compass is rotationally connected with the transmission connecting rod through the rotating screw. Three wind cups are arranged on the rotating screw. The bottom of the transmission connecting rod is connected with the wind power sensor. The switch is arranged on the telescopic screw. The battery bin is arranged at the bottom end of the telescopic screw. The switch is electrically connected with the battery bin. The device disclosed by the invention enables the hand-held detection and is simple in structure, complete in function, and convenient to use. By means of the wind direction compass, the buzzer and the compass, the accurate direction distinguishing function of the device is effectively improved. Meanwhile, the wind power is safely monitored. Through extending and shortening the length of the telescopic screw, theuse flexibility of the wind direction detection device is greatly improved.