A temperature difference compensation system includes a rotary table configured to support a fixture, a hot air jet, an infrared thermometer, and a programmable logic controller electrically coupled to the hot air jet and the infrared thermometer. The hot air jet, the infrared thermometer, and the programmable logic controller are spaced from each other and positioned above the rotary table. The infrared thermometer is configured to measure a temperature of the fixture and transfer a value corresponding to the measured temperature to the programmable logic controller. The programmable logic controller is configured to control the hot air jet to heat the fixture according to the temperature measured by the infrared thermometer.

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