Abstract: To investigate the crack-healing characteristics of the impervious layer in hydraulic asphalt concrete panels, this study employed beam bending tests, crack observation, and ultrasonic non-destructive testing to comparatively analyze the crack-healing behaviors of reference asphalt concrete and fiber-reinforced asphalt concrete from two dimensions: mechanical properties and structural integrity. The experimental results showed that after immersing asphalt concrete in water for 7 days, the adsorption effect and elastic properties of fibers effectively maintain the stability of mechanical properties. The bending healing rate of fiber asphalt concrete reached as high as 95%, whereas that of the reference asphalt concrete was only 41%. the water environment significantly promoted surface healing, with the highest surface healing rate reaching 97%, far superior to that in dry conditions. The internal damage repair of fiber-reinforced asphalt concrete had a healing characteristic of “hysteresis- strengthening”. The initial healing hysteresis was attributed to the oil absorption effect of fibers, which increased the thickness of structural asphalt. The synergistic deformation of fibers and asphalt ensured excellent continuous healing performance during 7-days period. This study established a multi-index collaborative evaluation methods for the crack-healing performance of asphalt concrete, providing an important theoretical foundation and data support for the engineering application of fiber-reinforced hydraulic asphalt concrete.