The invention discloses a waste incineration exhaust gas deacidification treatment system. The waste incineration exhaust gas deacidification treatment system structurally comprises waste incinerationequipment, an incineration exhaust gas pipeline, a smoke pipeline, a water supply pipe, a smoke discharge pipe, a circulating water tank, a high-pressure water pump, a smoke purifier and a deacidification water mist spraying tower, and the waste incineration equipment is connected with the deacidification water mist spraying tower through the incineration exhaust gas pipeline. Compared with the prior art, the waste incineration exhaust gas deacidification treatment system has the beneficial effects that through combination arrangement of parts such as a tilting nozzle, a top arc plate, an exterior plate, an inner supporting plate, a bottom arc plate and a separation arc plate, a novel spraying pipe is constituted, a function of preventing blocking of particulate matter is achieved, the particulate matter can be effectively prevented from making contact with a spray head, the spray area can further be enlarged, thus all exhaust gas can be subjected to spraying deacidification, and thusspraying deacidification is more comprehensive, higher in efficiency and better in effect; and meanwhile, the spray head can be prevented from being blocked by the particulate matter, thus the deacidified gas can be normal discharged, and the efficiency of waste incineration treatment is advantageously improved.