The invention discloses an external orthopedic fixing device for joints. The fixing device comprises upper-side splints, the upper-side splints are arc splints, and an upper middle splint is arrangedbetween the upper-side splints; the upper-side splints are bonded with the upper middle splint through connecting pads; the symmetrical upper-side splints are connected with lower-side splints throughan angle adjusting device, and a lower middle splint is arranged between the lower-side splints. According to the external orthopedic fixing device for the joints, by arranging the split-type splintswhich are connected through connecting pads, the upper and lower limbs of patient's joints are tightly fitted and clamped, and the clamping effect is good; the angle adjusting device is arranged, thestructure is simple, the angles among the splints are conveniently adjusted according to demands to adapt to patients with different disease conditions, and the wearing comfort of the patient is improved; buckle locking devices are arranged, so that the clamping tightness is conveniently adjusted, the comfort of the patients is improved, and meanwhile the assembly and disassembly are facilitated.