The invention relates to the field of operation tools and particularly relates to a clamp for dismounting a cage nut. The clamp comprises two clamping pins which are connected in a hinge joint manner;two opposite faces of the two clamping pins are provided with clamping grooves; when the two clamping pins are closed to be in contact with each other, the two clamping grooves on the two clamping pins are communicated with each other to form a clamping space which can be adaptive to the shape of the cage nut, so that the contact area between the clamp and the cage nut is relatively wide and thecontact is relatively stable; a condition that the cage nut slides in a clamping process is avoided; and meanwhile, the shape of the clamping space is matched with the appearance of the cage nut and the cage nut is not easily released from the clamp due to the limitation of the clamping space, and furthermore, the contact between the cage nut and the clamp is stable and the cage nut is convenientto dismount.