The invention provides a device for four-stage sedimentation treatment of concrete curing water. The device comprises an upper water tank and a lower water tank, and the upper water tank and the lower water tank are welded together through 'I'-shaped steel crossbeams. The upper water tank is partitioned into a primary sedimentation tank, a secondary sedimentation tank and a tertiary sedimentation tank by a first partition and a second partition, the tertiary sedimentation tank is positioned between the primary sedimentation tank and the secondary sedimentation tank, and the bottom of the tertiary sedimentation tank is provided with filter holes. The primary sedimentation tank and the tertiary sedimentation tank are partitioned through the first partition, and the secondary sedimentation tank and the tertiary sedimentation tank are partitioned through the second partition. A water flow tank is mounted between upper ends of the first partition and the second partition. The lower water tank is partitioned into a quaternary sedimentation tank and two concrete curing water tanks by two third partitions, and the quaternary sedimentation tank is positioned between the two concrete curing water tanks. The device has advantages that construction space is greatly saved, and quality in use of curing water is guaranteed by means of multi-stage sedimentation and filtration.