The invention relates to the technical field of medical equipment, in particular to a multifunctional fixing device for orthopedics. The multifunctional fixing device includes an outer barrel, the bottom of the outer barrel is connected with a first bearing seat, the first bearing seat is mounted on a bottom plate, the outer barrel is internally and slidably connected with an inner rod, a beam isarranged at the top of the inner rod, the beam is slidably connected with a telescopic rod, a mounting cylinder is fixed to the right end of the telescopic rod, a sleeve sleeves the mounting cylinder,the sleeve is provided with a fixed arc-shaped support, a fixed upper plate matched with the fixed arc-shaped support is arranged on the upper side of the fixed arc-shaped support, and a physiotherapy electrode plate is arranged on the concave surface of the fixed arc-shaped support. According to the multifunctional fixing device for the orthopedics, through sliding matching between the telescopic rod and a second fastening bolt, left and right movement of the fixed arc-shaped support is realized, through the first bearing seat, the outer barrel can rotate to realize rotation of the fixed arc-shaped support, the purpose of adjusting the horizontal position of the fixed arc-shaped support is achieved to facilitate use of patients, and adjusting is convenient.