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Optical fiber current transformer has become one of the most important equipment in power system, in the practical research, the detection accuracy of optical fiber current transformer is one of the important indexes, and the accuracy of the measured noise and internal harmonic optical fiber current transformer current often affecting the measurement. So it is very important to detect the harmonic of the optical fiber current transformer and to verify the practicability of the demodulation algorithm. Based on the detailed analysis of the existing harmonic detection theory and two kinds of demodulation algorithm, we design a detection and demodulation algorithm of optical fiber current transformer harmonic test system based on LabView integration, in the rapid detection of harmonic current and harmonic distortion level at the same time the demodulated information and comparing the measured current to verify the feasibility and superiority of two demodulation algorithm, the verification results show that the second kinds of demodulation algorithm accuracy is superior to the first demodulation algorithm, more suitable for signal demodulation of fiber optic current transformer.