Head-mounted device

The invention provides head-mounted equipment, which comprises an arc-shaped shell, a locking gear, an adjusting gear, a head band, a fixing plate and an elastic piece, and is characterized in that the arc-shaped shell comprises an annular wall, and the side wall of the annular wall is provided with limiting gear teeth; the locking gear can be at least partially clamped to the annular wall in the axial direction, so that the locking gear is internally engaged with or separated from the limiting gear teeth; the adjusting gear is connected to the locking gear through a gear shaft; each head belt comprises a rack which is meshed with the adjusting gear; the gear shaft is sleeved with the fixing plate. The elastic piece is arranged outside the gear shaft in a sleeving mode and connected between the fixing plate and the end face of the locking gear in an abutting mode. When the locking gear is driven to move in the axial direction, the locking gear is separated from the limiting gear teeth, so that the two racks m