Magnet exciting coil capable of improving self-cooling and insulating properties

The invention relates to the technical field of semiconductor monocrystalline silicon production industry, in particular to a magnet exciting coil capable of improving self-cooling and insulating performance, which is characterized in that an iron core main body is cylindrical, an inner side insulating ring is arranged on the outer ring surface of an iron core, and a glass fiber covered copper wire, an insulating backing plate and an insulating rod are positioned on the outer ring surface of the inner side insulating ring; the glass fiber covered copper wire, the insulating backing plate and the insulating rod form a winding group, the winding group is sleeved with the outer side insulating ring, the outer side insulating ring is sleeved with an inner cylinder, an outer cylinder is arranged outside the inner cylinder, and a cooling water cavity is formed between the inner cylinder and the outer cylinder; and an inner cylinder cooling liquid inlet and an inner cylinder cooling liquid outlet are both communicat