The present invention relates to a knee joint assist device, wherein a pivoting member of a knee joint assist device is extended downward from an upper support, a plurality of adjustment holes are formed in a circumferential direction at a corner portion with a gap therebetween, Two rotation control plates provided corresponding to each other； A first hinge hole formed in the shape of an 'S' between the two rotation control plates, the first hinge hole formed adjacent to the central axis of the rotation control plate and passing through the upper side, A first link rotatably linked by an end of the hinge pin； A second hinge hole provided in a '1' shape between the two rotation control plates and formed adjacent to the center axis of the rotation control plate at one side thereof and a second rotation hole formed at the rear end of the lower support plate, A second link having an end rotatably linked by a hinge pin； The first and second links being located outside of the two rotation control plates to arbitrarily limit the obtuse angle and the acute angle rotation of the lower support unit rotated from the rotation control plate through the rotation of the first and second links, Two angular adjustment portions rotatably coupled to the rotation control plate and having a fixed pin arbitrarily pinned along the adjustment hole of the rotation adjustment plate； And an adjusting cap which is located outside of the two rotation adjusting plates and is rotatably mounted on the central axis of the rotation adjusting plate and covers the angle adjusting unit so as not to be detached from the rotation adjusting plate, So that the upper and lower supports can be safely walked without inconveniencing the wearer as the upper and lower supports are rotated in the same radius as the turning radius of the knee joint through the link structure of the tiltable member, It is advantageous to prevent a safety accident such as chewing the flesh while walking.본 발명은 무릎관절 보조기구에 관한 것으로, 무릎관절
