A deadbolt knob security device is provided, whereby rotation of the deadbolt knob is linked to motion of an intermediate member assembly secured to a door element positioned next to the deadbolt knob. The device comprises several embodiments for surrounding the exposed interior knob of a deadbolt, as well as several embodiments for the adjustable intermediate member assembly between the deadbolt knob attachment and door knob attachment, wherein a door knob attachment member is provided in a U-shaped configuration to surround a door knob stem. Adjustability for accommodating doors of different design and specification is provided, while an electronic security monitor is accommodated along the device to monitor for tampering of the device while installed.