Annular water cooling screen and single crystal processing device

The utility model relates to an annular water-cooling screen and a single crystal processing device.The annular water-cooling screen comprises a cold screen body and a communicating pipe, the cold screen body comprises a first section and a second section which are arranged in the first direction and connected, the first section comprises a first inner wall and a first outer wall which are connected, and a first space is defined by the first inner wall and the first outer wall; the second section comprises a second inner wall and a second outer wall which are connected, a second space is defined by the second inner wall and the second outer wall, a cavity used for containing a crystal bar is formed by the first inner wall and the second inner wall, and the first direction is the stretching direction of the crystal bar; the two ends of the communicating pipe are connected to the first inner wall and the second inner wall correspondingly so that cooling liquid can sequentially flow through the first space, the