The invention provides a three-point bending clamp which comprises a base, supports, a centring plate and an upper pressure head; the base is provided with a fixing groove and a base centring mark; the supports are arranged on the base and are provided with an inspection mechanism; the lower part of the centring plate is arranged in the fixing groove; the centring plate is provided with an aligning centre joint; and the upper pressure head is arranged above the supports, is attached to the inner surface of the upper part of the centring plate and is provided with a base upper pressure head mark. The three-point bending clamp has the beneficial effects that the three-point bending clamp has the advantages of simpleness in device, rapidness and convenience in operation, high centring accuracy and the like, is suitable for three-point bending specimens in different sizes and has very good practical application value.