The invention discloses a road construction waste sludge recycling and use process which comprises steps such as primary filtering, mechanical dehydration, precipitation separation, stirring and mixing and curing molding. Mud and water in waste sludge can be separated, the water can be recycled and reused, and meanwhile, the separated mud can be molded and cured into a usable product; due to application of the process, the sludge can be completely treated and digested on a construction site, the problems that the sludge is piled and is hard to transfer are solved, environment pollution causedby the waste sludge can be avoided, meanwhile, waste can be turned into wealth, the sludge has commercial benefit value after being made into a commodity, in addition, a curing process of a mud material is short in time and high in efficiency in the process, the whole sludge treatment process has continuous operation of a production line, only 1-2 hours are taken from a first step of sludge filtering to pressing molding, the sludge treatment cycle is short, the operation efficiency is high, and the efficient treatment process can also solve the problem of floor occupation of piled sludge.