A headband , comprising a strap configured to bind a head, an adjustment assembly that adjusts the tightness of the strap , and an electronic device that enables an intelligent headband , the strap being connected to the adjustment assembly , and the electronic device being disposed within the adjustment assembly and connected to the adjustment assembly , wherein the adjustment assembly comprises an electronic receptacle for receiving the electronic device , a mechanical assembly for adjusting tightness of the strap , and a mechanical receptacle for an adjustment member to be placed, the electronic device is disposed within and connected to the electronic receptacle , and the mechanical assembly is disposed within and movably connected to the mechanical receptacle , wherein the mechanical assembly comprises a gear and a rack assembly , the rack assembly is meshingly connected to the gear , the gear is placed within and movably connected to the mechanical receptacle , and the rack assembly is slidably connected to the mechanical receptacle , wherein the rack assembly comprises a first rack and a second rack , the first rack and the second rack are located on two sides of the gear respectively, and are both meshingly connected to the gear , and the first rack and the second rack are both movably connected to the mechanical receptacle , characterized in that the headband further comprises a plurality of first electric wires and a plurality of second electric wires , the plurality of first electric wires are connected to the first rack , the mechanical receptacle , the electronic receptacle and the electronic device , and the plurality of second electric wires are connected to the second rack , the mechanical receptacle , the electronic receptacle and the electronic device . wherein the adjustment assembly comprises an electronic receptacle for receiving the electronic device , a mechanical assembly for adjusting tightness of the strap , and a mechanical receptacle for an adjustment member to be placed, the electronic device is disposed within and connected to the electronic receptacle , and the mechanical assembly is disposed within and movably connected to the mechanical receptacle , wherein the mechanical assembly comprises a gear and a rack assembly , the rack assembly is meshingly connected to the gear , the gear is placed within and movably connected to the mechanical receptacle , and the rack assembly is slidably connected to the mechanical receptacle , wherein the rack assembly comprises a first rack and a second rack , the first rack and the second rack are located on two sides of the gear respectively, and are both meshingly connected to the gear , and the first rack and the second rack are both movably connected to the mechanical receptacle , characterized in that the headband further comprises a plurality of first electric wires and a plurality of second electric wires , the plurality of first electric wires are connected to the first rack , the mechanical receptacle , the electronic receptacle and the electronic device , and the plurality of second electric wires are connected to the second rack , the mechanical receptacle , the electronic receptacle and the electronic device . <EOS>