Waste gas treatment device and waste gas treatment system after ammonium sulfate drying

The utility model relates to the technical field of ammonia desulfurization, in particular to a waste gas treatment device and a waste gas treatment system after ammonium sulfate drying. The ammonium sulfate dried waste gas treatment device comprises a washing tower body and at least two stages of filler layers, spraying layers and demisters which are arranged in the washing tower body at intervals up and down, an air outlet is formed in the top of the washing tower body, an air inlet and a liquid outlet are formed in the bottom of the washing tower body, the air outlet is connected with an air exhaust pipe, and the liquid outlet is connected with a liquid outlet. The exhaust pipe is used for being communicated with a gas inlet pipeline of the desulfurization tower body, the exhaust pipe is provided with an electric valve used for controlling on-off of waste gas, and a flushing mechanism capable of spraying flushing fluid is arranged at the air inlet; the washing tower body is also provided with a liquid inle