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1. A three-arm clamp, comprising: a clamping assembly and a releasing member connected to each other, wherein the clamping assembly comprises a fixed arm and two movable arms respectively rotatably connected to the fixed arm through a hinge pin, a first sliding slot is provided at a proximal end of each movable arm, a sliding pin is slidably provided in the first sliding slot, an inner cavity is formed at a proximal end of the fixed arm, the releasing member is inserted into the inner cavity and connected to the sliding pin, an elastic sheet is further provided at the proximal end of each of the movable arms; when the movable arms clamp and are closed with the fixed arm, the elastic sheet is folded in the inner cavity and abuts against the releasing member along a radial direction of the fixed arm from a connecting end to a free end; and the releasing member is separated from the movable arms, and the free end of the elastic sheet elastically abuts against an inner wall of the inner cavity, wherein a clamp holder is further provided at the proximal end of the fixed arm, the inner cavity is formed between the clamp holder and the fixed arm and inside the clamp holder, the releasing member is detachable from the movable arms, and the free end of the elastic sheet elastically abuts against an inner wall of the clamp holder.
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