The invention relates to the technical field of road repair, in particular to production and construction technologies of a road sealant applicable to road crack repair of pavements made of various materials. The road sealant mainly comprises 29% by mass of matrix asphalt, 15% by mass of fine rubber powder, 45% by mass of fossil meal, 0.4% by mass of SBS (styrene butadiene styrene) modified asphalt, 0.4% by mass of butadiene styrene rubber powder, 0.1% by mass of an active agent, 0.1% by mass of a tackifier and 10% by mass of diesel oil. The road sealant has high applicability, can be widely applied to crack pouring repair of asphalt pavements such as asphalt and concrete highways, expressways, high-grade highways, urban highways, airport runways and the like as well as seam sealing repair of cement concrete pavements and can be further applied to expansion joints of bridges or structures; when the construction technology is adopted for construction, the driving feeling on the repaired road is excellent, the traffic noise is small, and various problems that cannot be solved with the traditional technology can be solved by the aid of the excellent sealing performance, waterproofness, high-strength adhesion, high-temperature resistance, good low-temperature adhesion and the like of the road sealant.