A belt buckle with long usage rate, which includes a buckle body and a mounting member, wherein the left side surface and the right side surface of a mounting rod body are both cutting planes, the left side surface of the mounting member is provided with a through concave cavity, the left end of an upper sheet body and the left end of a lower sheet body are both integrally formed with extension sheets extending downwards, a clamping interval is arranged between the free ends of the two extension sheets, the mounting rod body is clamped into the through concave cavity through the clamping interval and is rotatably arranged in the through concave cavity. The buckle body is detachably connected with the mounting member, so that the free combination of different buckle bodies and different mounting members is realized.