The present invention relates to a walking assistance device using a pneumatic system. According to the present invention, the walking assistance device using a pneumatic system, which helps walking by having the walking assistance device worn on a lower body of a wearer, comprises: upper main bodies attached to sides of thighs of the wearer lower main bodies attached to sides of parts between knees and ankles of the wearer and air pumps installed on a waist of the wearer, including cylinders having air discharge holes in upper portions, including pistons performing an up-and-down motion inside the cylinders, and having piston rods of which upper end portions are combined with the pistons, and stretched downward by penetrating through lower end sides of the cylinders connecting members where upper end portions are hinge-combined with lower end portions of the piston rods while lower end portions are combined with the upper main bodies and perform a hinge motion in a forward-backward direction by having a combined area as a rotation center in accordance with the forward and backward movement of the upper main bodies joint portions located next to the knees of the wearer, having fixing portions combined with lower end portions of the upper main bodies, having rotary shafts combined with the fixing portions, having rotating portions rotatable around the rotary shafts, and combined with upper end portions of the lower main bodies, and having air injection holes and rotation driving elements installed inside the joint portions to be communicated with the air discharge holes, an air hose connecting the air injection holes, and the air injection holes, and applying a rotary force to the rotating portions by an air pressure when air is injected through the air injection holes.COPYRIGHT KIPO 2015본 발명은 공압시스템을 이용한 보행 보조 장치에 관한 것으로, 본 발명에 따른 공압시스템을 이용한 보행 보조 장치는 착용자의 하체에 착용하여 보행을 돕기 위한 보행 보조 장치에 있어서, 상기 보행 보조 장치는, 착용자의 넓적다리의 측면에 부착되는 상부 본체와, 착용자의 무릎과 발목 사이 부분의 측면에 부착되는 하부 본체와,
