The invention discloses a continuous settling machine used for treatment of waste drilling fluids. The continuous settling machine includes a shell body, a material feeding cylinder arranged in the shell body, a material slurry pipe arranged on the lower part of the shell body, and a clear liquid pipe disposed on the upper part of the shell body. The upper end of the shell body is sealed by an upper cover, wherein the upper end of the material feeding cylinder is stretched out from the upper cover and is sealedly and fixedly connected to the upper cover. A cylindrical cushion cylinder having a liquid outlet is arranged in the middle of the shell body. The upper end of the cushion cylinder is sealed and fixed by means of a sludge blocking board having through holes. The lower end of the cushion cylinder is fixedly connected to the inner wall of the shell body through a plurality of positioning rods. The lower end of the material feeding cylinder is opened and is deeply arranged in the cushion cylinder. The material feeding cylinder is sealedly fixed to the sludge blocking board. Compared with a structure in the prior art, the continuous settling machine is low in disturbance. The continuous settling machine works mainly in a natural settling manner with assistance of structural filtration, so that the continuous settling machine is enhanced in processing capacity, and is low in content of suspension substances in generated clear liquid, is reduced in treatment period and is free of waiting for complete settlement of the waste drilling fluids, thereby improving the adaptability of the continuous settling machine.