The utility model discloses a T-Hz wave detector, which is used for detecting T-Hz waves from a T-Hz wave radiation source, and includes a substrate, a superconducting material thin film, a cryostat and a detection circuit, wherein the superconducting material thin film is adhered onto the substrate, and adopts a single-strip long-range line type structure extending on the substrate in a zigzag and compact manner; the cryostat accommodates the substrate and the superconducting material thin film and can be used for providing temperature of a superconducting transformation temperature zone where the superconducting material thin film is positioned; the cryostat is provided with a window, and to-be-detected T-Hz waves can penetrate the window to irradiate on the superconducting material thin film; and the detect circuit is connected with the two ends of the superconducting material thin film adopting the long-range line type structure. The T-Hz wave detector provided by the utility model has high sensitivity and signal-to-noise ratio, low noise equivalent power, simple structure and excellent stability, and is particularly suitable for the detection of the T-Hz wave radiation source with low power and big beam spot.