The invention discloses an asphalt pavement prefabricated block repairing pit slot structure and a construction process thereof. The number and the size of damaged road section pit slots are determined to perform unified processing of prefabricated blocks, the pit slots are excavated in a centralized mode for unified filling repair, a construction period is short, and the influence on traffics is small. According to the process, the closing time is short, used repair materials are convenient to store, and are cold-mixed in a normal temperature state and are easy to form, a preparation process is simple, the early strength is high, the forming time is short, the elasticity modulus is moderate, the cooperativity with the road surface is good, and a second interface healant layer, a geotechnical grid layer, a CAS layer, a second interface healant layer and a prefabricated block layer are sequentially laid and are fixed by an interface healant. The asphalt pavement prefabricated block repairing pit slot structure is simple, high in strength, capable of performing line production and high in repair efficiency and is especially suitable for emergent repairs, such as rescue and relief works for road smoothing. Filling buffer and embedment roles are played between the CAC prefabricated blocks and original road surfaces to prevent water from seeping into joints.