Head-mounted adjustment device and head-mounted display apparatus

A head-mounted adjustment device, comprising:

• a housing, having an adjusting cavity and an adjusting opening connected to the adjusting cavity;
• a connecting rod, movably installed in the adjusting cavity, configured to move in the direction close to or away from the adjusting opening;
• a first magnetic member, installed at an end of the connecting rod to move synchronously with the connecting rod;
• a second magnetic member, installed in the housing, wherein the second magnetic member is at least partially located on one side of the first magnetic member close to the adjusting opening;
• parts of the first magnetic member and the second magnetic member facing each other are isotropic magnetic poles of each other, so that the first magnetic member and the second magnetic member produce magnetic repulsion;
• and
• a strap, having one end connected to the connecting rod, and another end extends out of the adjusting opening to expand and contract in a direction close to or away from the adjusting opening.