The invention relates to terahertz pulse imaging, and provides a high-performance terahertz time-domain spectral imaging device. The terahertz time-domain spectral imaging device has the advantages of simplicity, easiness in adjustment, high stability, high signal to noise ratio, wide broadband, high speed, flexibility, convenience, rapidness and high space resolution ratio. The multifunctional terahertz time-domain spectral imaging device based on femtosecond laser comprises an optical fiber femtosecond laser device, an optical fiber, an optical fiber beam splitter, an optical fiber delay line, an optical fiber integrated terahertz transmitting antenna, a COC terahertz lens, an optical fiber collimator, a frequency multiplication module, a lens, a reflector, a terahertz probe, a two-directional electric detection translation stage, a three-dimensional electric sample frame, a square-wave voltage source, a current amplifier, a phase-locked amplifier, a data collection card and a computer. The terahertz time-domain spectral imaging device is mainly applied to terahertz pulse imaging.