The invention discloses a blink frequency measuring device. The blink frequency measuring device comprises a wearable terminal, a measuring unit and magnetic components, wherein the wearable terminal can be worn on the head of a measured person, and the magnetic components have magnetism and can be fixed to the eyelids of the measured person; the measuring unit is mounted on the wearable terminal and used for detecting changes of magnetic fields of the magnetic components and converting the changes into blink frequency data. The blink frequency measuring device is convenient to wear and also has the advantages that measurement is accurate, real-time performance is high, and data processing is easy and convenient.