The invention provides a fixed support special for a wall-through sleeve, belonging to the field of a cable fixing device. The fixed support comprises cross beams and vertical beams, wherein the cross beams and the vertical beams are all angle irons, two cross beams and two vertical beams are welded to form a fixed frame, an upper fixed plate and a lower fixed plate are arranged in the fixed frame, semicircular clamping grooves arranged on both of the upper fixed plate and the lower fixed plate, the semicircular clamping grooves on the upper fixed plate and the lower fixed plate form a clamping groove, and the clamping groove can be used for fixing the wall-through sleeve.