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This utility model relates to a pulling clamping mechanism for a lithium tantalate single crystal rod pulling growth system, comprising: a first clamping plate and a second clamping plate fixedly connected together; a first clamping block, which is fixedly clamped between the first clamping plate and the second clamping plate; a third clamping plate and a fourth clamping plate fixedly connected together; a second clamping block, which is fixedly clamped between the third clamping plate and the fourth clamping plate; and a pivot, which allows the assembly composed of the first clamping plate and the second clamping plate to pivot relative to the assembly composed of the third clamping plate and the fourth clamping plate, and the assembly composed of the third clamping plate and the fourth clamping plate to pivot relative to the assembly composed of the first clamping plate and the second clamping plate, thereby causing the first clamping block and the second clamping block to move away from or towards each other.