Clamp holder

The embodiment of the invention provides a clamp holder which comprises a clamp holder body and a clamping arm, and the clamp holder body is provided with a clamping wall; the clamping arms are connected to the clamp holder body and can rotate relative to the clamping walls, and clamping spaces used for clamping are formed between the clamping walls and the clamping arms. At least two different clamping faces are arranged on the side, facing the clamping wall, of the clamping arm, the multiple clamping faces are arranged in the direction from the position close to the rotating center to the position away from the rotating center, and each clamping face comprises an inclined face or an arc face. And each inclined surface or cambered surface extends from one side close to the rotating center to one side far away from the rotating center to the direction of the clamping wall. When the clamp holder is used for clamping the side rails of the operating bed, the clamp holder can be fixed to the side rails of differe