Provided is a method for aseptically filling a bag with medicine or liquid, which comprises: (a) a first step of inserting a cap into an inlet of a bag; (b) a second step of lifting the cap to introduce related medicine or liquid; (c) a third step of re-inserting the cap into the inlet of the bag; and (d) a fourth step of welding the inlet of the bag to the cap. The method for aseptically filling a bag with medicine or liquid: is simple and scalable; has a flexible form in spatial and temporal aspects; and eliminates or minimizes the risk that the medicine or liquid is contaminated by particles (generated during a welding process) or contaminated biologically, thereby being able to preserve a physical property, biological property, appearance, or color of the medicine or liquid.COPYRIGHT KIPO 2016의약품 또는 액체로 백을 무균 충전시키는 방법이 제공되는바, 상기 방법은:(a) 상기 백의 유입부 안에 캡이 삽입되도록 하는 제1 단계;(b) 상기 캡이 상승되고, 관련된 의약품 또는 액체가 도입되는, 제2 단계;(c) 상기 백의 유입부 안에 상기 캡이 다시 삽입되도록 하는 제3 단계; 및(d) 상기 백의 유입부와 캡이 용접되는 제4 단계;를 포함한다.