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Eddy current nondestructive testing technology is a non-contact testing technology based on electromagnetic theory, which has the advantages of simple structure, no medium influence, strong anti-interference ability and so on. This paper designs a variable frequency detection system based on zynq-7020 platform. Zynq-7020 is a system on chip. The platform can not only give full play to the advantages of FPGA parallel computing, but also has the flexibility of processing system, which can realize high-speed data acquisition and real-time processing. The frequency of the excitation signal can be changed by the upper computer to adapt to the detection of metal with different thickness. The system realizes impedance decomposition from the perspective of digital signal processing, and can significantly extract the defect signal. The feasibility of the system is verified by experiments.