Provided is a plasma treatment apparatus that does not use a separate process gas by discharging low-pressure atmosphere formed in a sealed space in which a plasma surface treatment is performed. Therefore, by discharging the low-pressure atmosphere using a relatively low voltage, stable plasma with high surface treatment efficiency may be generated, and thus a plasma treatment apparatus may be configured economically and no operation and management costs due to the use of a process gas are incurred. Also, the safety and the effectiveness of a plasma surface treatment process to be applied in the medical industry are secured, and sterility may be secured and usability may be maximized.