The W-Fe-C composites were prepared using spark plasma sintering (SPS) at various sintering temperatures, and their sintering behavior, phase composition, microstructure, and mechanical properties were characterized. The densification mechanism was also analyzed. The results show that as the temperature increases, the reinforcement phase in the composite transitions from Fe?W?C to Fe?W?C, and finally to Fe?W?C. After sintering at 1400 °C, the sample achieved a relative density of 99.2%, with an ultimate compressive strength of 2455.15 MPa and a deformation rate of 25.42%. During the holding stage, the W-Fe-C composite exhibited a unique creep recovery stage, where the densification rate was nearly zero. When the effective stress exponent (n) was approximately 1 and 2, the estimated activation energies were 341.27 and 1005.73 kJ/mol, respectively, which are higher than that of pure tungsten. However, due to the in-situ reaction promoting diffusion, the relative density of the W-Fe-C composites exceeded that of pure tungsten. This study provides a new approach for the low-temperature fabrication of tungsten-based composites.