The invention discloses a novel auxiliary device for orthopedic treatment. The device comprises a bottom plate, wherein first electric telescopic rods are installed at the portions, close to the edgesof the front and rear sides of the two sides, of the top of the bottom plate; a long plate is welded between the tops of the two first electric telescopic rods; and supporting rods are welded to theportions, close to the edges of the front and rear sides, of the top of the long plate. Accordingly, by starting the first electric telescopic rods, the height of the long plate can be adjusted; in use, the height of arc-shaped plates can be adjusted, and use is convenient; meanwhile, by starting second electric telescopic rods, a lifting plate can be lifted as a whole, a turnover plate is turnedover, and one arc-shaped plate is lifted conveniently; in use, the legs of a patient are placed inside the two arc-shaped plates, and by means of hook-and-loop fasteners on the arc-shaped plates, thelegs inside the arc-shaped plates can be fixed; and in use, the legs of the patient are lifted and fixed conveniently, and the patient can use the device for rehabilitation conveniently.