The invention discloses a sludge co-firing system and a control system thereof. According to the sludge co-firing system, sludge is conveyed to a sludge pipeline from the bottom of a sludge cabin which is provided with a cabin cover through a conveying device; a sludge pump which is arranged on the sludge pipeline conveys the sludge to a sludge feeding device; the sludge feeding device is arranged on a gasifier; the sludge cabin is communicated with an exhaust pipeline; the exhaust pipeline discharges exhaust gas inside the sludge cabin to the gasifier through a gasifier ventilator; a incinerating thing discharging device is arranged at the bottom of the gasifier. The sludge co-firing system has the advantages of reducing exploitation of non-renewable natural resources and achieving resource circulation and economic sustainable development; disposing municipal sludge meanwhile city household garbage is completely decomposed and solving the secondary pollution problem caused by sludge disposal; completely achieving harmless, reducing and recycling sludge disposal due to the fact that waste residue generated through sludge burning is served as replacement raw material for cement production.