Electric field tomography imaging technique has great application potential in human physiological and pathological detection due to its advantages of non-contact, non-destructive, and functional imaging. However, the existing technique has not been applied in practice due to the high requirements for high-frequency excitation and synchronous phase shift detection. In this paper, we design a high-frequency excitation system for electric field tomography imaging based on FPGA and DDS technology, use fast Fourier method with multi-channel acquisition to realize synchronous measurement of phase shift of same-frequency sinusoidal signals, and develop image reconstruction algorithm based on Tikhonov regularization method. We build an electric field tomography imaging system and conduct experiments to detect target objects with different sizes, positions and numbers using the system. The experimental results show that the system can detect the target objects, verifying the effectiveness and correctness of our work.