Sludge treatment system

The utility model provides a sludge treatment system comprising a preheating device, a reaction device and a flash distillation device which are sequentially arranged in parallel, wherein a high-pressure steam device is connected with the bottom of the reaction device; the needed steam is supplied into the reaction device by virtue of the high-pressure steam device to ensure that the reaction device reaches a certain temperature; a steam return branch I is connected to the top part of the reaction device; a steam return branch II is connected to the top of the flush distillation device; the steam return branch I and the steam return branch II are connected with a steam return pipeline; the steam is delivered into the preheating device by virtue of the steam return pipeline to provide the temperature needed by the preheating device; and moreover, the flash distillation device can deliver the remaining steam into the preheating device. When the sludge treated by the sludge treatment system provided by the utility model is subjected to anaerobic digestion, the conversion rate of organic substances of the sludge is improved, so that more biogas can be obtained, the resourceful treatment of the sludge is realized, and the aims of saving energy, reducing emission and reducing carbon tracks are achieved simultaneously.