The invention discloses a traditional Chinese medicine extraction and concentration tank having a near-infrared online detection function. The traditional Chinese medicine extraction and concentration tank comprises a tank body and a tank cover, wherein an optical fiber sensor base is arranged at the middle-lower portion of the tank body and comprise a tubular body and a cover body with a middle hole, an optical fiber sensor probe is movably connected with the inner wall of the tubular body through a seal rubber ring, the upper end of the tubular body is movably connected with the cover body with the middle hole, and the upper portion of the optical fiber sensor probe penetrates through the middle hole of the cover body. An outer thread is arranged at the lower end of the optical fiber sensor probe, an inner thread is arranged on the inner surface of the side wall of a probe cap, a hole is formed in the lower portion of the probe cap, a reflection mirror is arranged on the upper surface of the bottom wall of the probe cap, the probe cap is connected with the optical fiber sensor probe, and the optical fiber sensor probe is connected with an near-infrared spectroscope through an optical fiber. The traditional Chinese medicine extraction and concentration tank achieves near-infrared online detection of different parts in the extraction and concentration process, effectively improves analysis accuracy and precision and can be used for guiding the mass production process of traditional Chinese herb preparations.