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When using a motor-driven displacement stage or scanning frame to perform continuous two-dimensional planar scanning of large components based on the eddy current method, since the motor runs continuously in three stages of acceleration, constant speed and deceleration, the motor operation and data acquisition clock are inconsistent, causing the mismatch of the sampling points to the actual position in space. Therefore, a two-dimensional continuous synchronous scanning system for eddy current detection based on LabVIEW is proposed to improve the detection efficiency and accuracy of the system. By comparing and analyzing the encoder pulses and crystal clock pulses of the acquisition card during acceleration and deceleration of the motor, and using the encoder pulses and crystal clock pulses as trigger clocks for data acquisition by the data acquisition card. The experimental verification shows that when using the crystal clock pulse as the trigger clock for data acquisition, there is an obvious deviation between the image crack location and the actual crack location. When the encoder pulse is used as the trigger clock for data acquisition, the crack location of imaging is basically consistent with the actual crack location, which verifies the reliability of the system and the feasibility in engineering application.