The invention discloses a sludge treatment system and a method thereof, wherein the sludge treatment system comprises a pump, an ozone generation device, an ejector and a pipeline reactor which are orderly connected by pipes. The sludge treatment system comprises the following steps of: (1) when sludge water to be treated is conveyed to the ejector by the pump in a certain speed, a side inlet of the ejector generates negative pressure to suck ozone generated by the ozone generation device, the sludge water and the ozone are mixed to form a mixture; and (2) the mixture enters a pipe reactor by a pipe, and the mixture is fully contacted with a catalyst layer in the pipeline reactor, to carry out oxidation reduction reaction under catalysis of the catalyst. The sludge treatment system implements modularization production of a sludge deweighting treatment system, does not need to reconstruct a current sludge system, eliminates offensive odor of the sludge treatment system and an outward mud cake, reduces energy consumption in a production process, and reduces a sludge discharge total amount of the system.