A surface treatment apparatus includes a chamber defining an accommodation space therein, an injection part provided at a first end of the chamber so as to inject gas into the accommodation space, a discharge part provided at a second end of the chamber that is opposite the first end so as to discharge unreacted gas from the accommodation space, and at least one subchamber loaded in the accommodation space in the chamber between the first end and the second end, where powder is charged in the subchamber, and the subchamber includes a mesh structure provided in at least one surface of the subchamber so as to allow the gas to be introduced into the subchamber, and the subchamber is movable from the first end to the second end.