The invention provides a mounting clamp special for an angle-steel tower. The mounting clamp comprises a mounting clamping plate, a right-angle steel clamp and a T-shaped fastening strip; the T-shapedfastening strip comprises a vertical rod and a tail rod, the vertical rod is vertically connected to the middle of the tail rod, the tail rod is tightly attached to a main material angle steel of theangle-steel tower, the vertical rod is fixedly connected to the vertical end of the right-angle steel clamp, the horizontal end of the right-angle steel clamp is connected with the mounting clampingplate through the fixing manner of adjusting the transverse distance, cooperation of the mounting clamping plate, the right-angle steel clamp and the T-shaped fastening strip is used for enabling themain material angle steel to be firmly clamped among the mounting clamping plate, the right-angle steel clamp and the T-shaped fastening strip, the stable clamping state is formed, and an addition device and the main material angle steel are connected in a fastened manner. Meanwhile, the main material angle steel cannot be damaged, the mounting manner is simple, and the clamping effect is obviously improved.