The invention discloses a mounting structure of a safety belt buckle capable of preventing cushion interference. The mounting structure comprises a safety belt buckle, a cushion, seat slides and a seat-belt fixing frame, a horizontal plate of the seat-belt fixing frame is fixedly mounted directly over the seat slides, and a cylinder boss is welded to the outer wall of the vertical plate of the seat-belt fixing frame; the cylinder boss comprises an inside major diameter segment and an outside minor diameter segment, and a limiting spacer fixedly sleeves the minor diameter segment; a limiting protrusion facing outwards is arranged on the limiting spacer; a bolt penetrates through the safety belt buckle, the cylinder boss, and the vertical plate of the seat-belt fixing frame, so that the lower end of the safety belt buckle and the seat-belt fixing frame are connected; the limiting protrusion just extends out from a limiting notch correspondingly formed in the safety belt buckle, so that the safety belt buckle is prevented from rotating; a gap is formed between the safety belt buckle and the cushion. The mounting structure has the characteristics of being simple in structure, low in cost, safe and reliable, the original structure is not changed, and direct loading can be realized.