The utility model relates to a thickener, which comprises a sedimentation device, wherein the sedimentation device comprises an inclination pipe. The thickener is characterized in that the sedimentation device also comprises a box body, the upper part of the box body is provided with a material inlet and an overflow water pipe, the lower part of the box body is provided with a conical hopper, and the inclination pipe is arranged in the box body and above the conical hopper. The thickener has the advantages that the inclination pipe is combined with the conical hopper, the thickener is particularly suitable for being used for recovering fine particle mine slurry or coal slurry, in addition, the structure is simple, the operation is convenient, the automatic control is adopted in the whole process, the unit mine slurry treatment capability can reach 8 to 10 cubic meter/square meter*hour and is 2 to 2.5 times of that of inclined plate type and inclined pipe type thickeners, the investment is saved, and in addition, the work efficiency is improved.