This paper presents a comprehensive review of both experimental measurements and nuclear data evaluations for the deuteron-tritium (D-T) fusion reaction cross sections at incident deuteron energies below 300 keV. The historical experiments are classified according to three target technologies: thick solid targets, thin solid targets, and gas targets. Our critical analysis reveals that early experiments using thick solid targets suffered from substantial technical flaws, resulting in data of poor reliability. For energies below 20~30 keV, experiments based on thin solid targets or foil-contained gas targets encounter severe operational difficulties, and data from the latter require significant correction to improve their quality. Furthermore, owing to the immature calorimetric techniques before 1960, most data from windowless gas-target experiments are of relatively low quality. In the sub-20 keV region, only five experimental datasets have been reported to date: one using a heavy-ice target, two using ultra-thin solid targets, and two using windowless gas targets. Among these, the windowless gas-target datasets exhibit the highest quality, whereas the others display systematic discrepancies. The evaluation activities on D-T fusion cross sections are also systematically compiled. After 1990, evaluated fusion reaction data of the United States and Europe have been successively integrated into the major evaluated nuclear data libraries, namely ENDF (Evaluated Nuclear Data File) and JEFF (Joint Evaluated Fission and Fusion File), thereby facilitating standardized data archiving and international sharing. Finally, several commonly used parametric formulas for the D-T fusion cross section are compared. In the energy range of 6~350 keV, the Gaganov formula provides the best accuracy; however, in the wider range of 1~1000 keV range, the Bosch-Hale formula, derived from the R-matrix theory, exhibits a maximum deviation of 3.7% and offers the most balanced overall performance. The datasets presented in this paper, including a brief introduction to the experimental setup, the differential cross-section data and the integral cross-section data, are openly available at https://www.doi.org/10.57760/sciencedb.41598 (Please use the private access link https://www.scidb.cn/s/rUveEn to access the dataset during the peer review process).