Clamp, crystal bar grabbing device and single crystal furnace

The invention relates to the technical field of single crystal furnaces, in particular to a clamp which comprises a base and a base fixing part. The number of the clamping blocks is two, the two clamping blocks are oppositely arranged, a clamping space is formed between the two clamping blocks, at least one clamping block is connected to the base in a sliding mode, and the sliding direction is parallel to the arrangement direction of the two clamping blocks; and the driving assembly is fixed on the base and acts on the clamping block capable of sliding. The crystal bar clamping device has the beneficial technical effects that the clamping blocks are slidably connected to the base, the adjusting blocks are connected with the clamping blocks through the connecting rods, the two ends of the connecting rods are rotationally connected with the adjusting blocks and the clamping blocks correspondingly, and by driving the positions of the adjusting blocks relative to the base, clamping or releasing of a crystal bar b