Clamp of adapting pipe

The invention discloses a clamp of an adapting pipe. The clamp comprises a base, a supporting seat, a transposition angle iron, a clamping mechanism, a supporting mechanism and a compressing mechanism, wherein the supporting seat is fixedly connected to the base; the transposition angle iron is rotatably arranged on the supporting seat by treating a horizontal axis as the axis; the transposition angle iron is a stepped surface and provided with a first platform, a second platform and a third platform from top to bottom; a vertical clamping plate which is in match with the adapting pipe is fixedly connected to one end, far away from the first platform, of the second platform; a horizontal clamping plate which is in match with the adapting pipe is fixedly connected to one end, close to the second platform, of the first platform; the clamping mechanism is arranged on the second platform and used for clamping the adapting pipe; the supporting mechanism is positioned below the first platform and arranged on the ba