Arm fixator

The utility model provides an arm fixator, and belongs to the technical field of medical instruments. Comprising a fixing frame and an arm supporting plate used for supporting an arm, one end of the arm supporting plate is fixedly connected with a binding belt used for fixing the arm supporting plate to the arm, a detachable soft breathable pad is installed in the arm supporting plate, the soft breathable pad is installed in the fixing frame, and the arm supporting device further comprises an adjusting mechanism used for adjusting the arm supporting plate to be attached to arms with different thicknesses. The adjusting mechanism is connected with the fixing frame. By arranging the lead screw, the sliding rod and the fixing plate fixedly connected with the arm supporting plate, the lead screw is rotated through the rotary knob, the arm supporting plate is driven to move when the lead screw moves, and therefore the size of an opening of the arm supporting plate is adjusted, arms with different thicknesses can b