Abstract: Construction wastes have attracted more and more public attention with the development of the urban construction. A waste drilling slurry treatment process is introduced to solve the problem of slurry treatment. The process, with the aim of zero discharge of pollutants, includes three steps: slurry purification, flocculation and pressure filtration, after which the slurry is separated into soil and water. The engineering properties and microstructure of the separated soil are studied. The experimental results show that the separated soil, with a compact structure, has a modulus of compressibility of 23 MPa and a calculated bearing capacity seven times that of the sediment. It is demonstrated that the separated soil has good properties of deformation and strength. Thus, the waste slurry has changed from the construction waste to the construction material and can be recycled. The separated sand can be used as the raw material for cement mortar while the separated soil can be used for backfill or brick production.