A production system for a hafnium crystal bar comprising: a power supply unit with a large DC current; an iodizer; a molybdenum insulator provided inside the iodizer; a thermostatic device capable of accommodating the iodizer; a cooling unit for cooling the iodizer; a vacuum unit for vacuumizing the iodizer; an iodine box for adding iodine into the iodizer, wherein the iodine box is controlled by a ball valve; an electrode unit electrically connected to the power supply unit, wherein the electrode unit is disposed above the iodizer; and a crystallization unit provided inside the iodizer, wherein the crystallization unit is connected to the electrode unit; wherein, the thermostatic device is a structure with an insulation layer provided outside an inner tank, wherein the inner tank of the thermostatic device is filled with a saline solution; wherein the iodizer is fixedly mounted inside the inner tank of the thermostatic device and is completely immersed in the saline solution; wherein the thermostatic device is further provided with a thermocouple extending into the saline solution, wherein the thermocouple is used for measuring a temperature of the saline solution; the electrode unit comprises an electrode rod, a molybdenum electrode rod located below the electrode rod, an electrode tip located at a bottom of the molybdenum electrode rod, wherein the molybdenum electrode rod is connected to the electrode rod by a screw thread, wherein a core wire of the crystallization unit is a hafnium wire and both ends of the core wire are connected to the electrode tip; wherein a core wire fixing device is provided inside the iodizer, wherein the core wire fixing device comprises a molybdenum rod connected to the cover of the iodizer, a molybdenum plate connected to the molybdenum rod, and an insulating ceramic piece connected to the molybdenum plate, wherein a molybdenum wire for fixing the core wire is fastened to the insulating ceramic piece; characterized in that the electrode rod is made of a chromium-zirconium-copper rod; the molybdenum plate is provided with a gap in the middle of the molybdenum plate to minimize the effect on the growth of the hafnium crystal bar; an electric heating wire is provided between the inner tank and the insulation layer; wherein a bottom of the molybdenum electrode rod is fixedly connected to a cover of the iodizer through a molybdenum sleeve, and an insulating ferrule is arranged between the molybdenum electrode rod and the molybdenum sleeve. a power supply unit with a large DC current; an iodizer; a molybdenum insulator provided inside the iodizer; a thermostatic device capable of accommodating the iodizer; a cooling unit for cooling the iodizer; a vacuum unit for vacuumizing the iodizer; an iodine box for adding iodine into the iodizer, wherein the iodine box is controlled by a ball valve; an electrode unit electrically connected to the power supply unit, wherein the electrode unit is disposed above the iodizer; and a crystallization unit provided inside the iodizer, wherein the crystallization unit is connected to the electrode unit; wherein, the thermostatic device is a structure with an insulation layer provided outside an inner tank, wherein the inner tank of the thermostatic device is filled with a saline solution; wherein the iodizer is fixedly mounted inside the inner tank of the thermostatic device and is completely immersed in the saline solution; wherein the thermostatic device is further provided with a thermocouple extending into the saline solution, wherein the thermocouple is used for measuring a temperature of the saline solution; the electrode unit comprises an electrode rod, a molybdenum electrode rod located below the electrode rod, an electrode tip located at a bottom of the molybdenum electrode rod, wherein the molybdenum electrode rod is connected to the electrode rod by a screw thread, wherein a core wire of the crystallization unit is a hafnium wire and both ends of the core wire are connected to the electrode tip; wherein a core wire fixing device is provided inside the iodizer, wherein the core wire fixing device comprises a molybdenum rod connected to the cover of the iodizer, a molybdenum plate connected to the molybdenum rod, and an insulating ceramic piece connected to the molybdenum plate, wherein a molybdenum wire for fixing the core wire is fastened to the insulating ceramic piece; characterized in that the electrode rod is made of a chromium-zirconium-copper rod; the molybdenum plate is provided with a gap in the middle of the molybdenum plate to minimize the effect on the growth of the hafnium crystal bar; an electric heating wire is provided between the inner tank and the insulation layer; wherein a bottom of the molybdenum electrode rod is fixedly connected to a cover of the iodizer through a molybdenum sleeve, and an insulating ferrule is arranged between the molybdenum electrode rod and the molybdenum sleeve.