Spray tower with expandable filter layer

The spray tower comprises a spray tower body, a plurality of turnover filter layers are arranged in the spray tower body, a synchronous linkage mechanism is arranged between the turnover filter layers, an annular shielding flow guide structure is arranged on the inner wall of the spray tower body below the turnover filter layers, and according to the content of dust particles in waste gas, the inner wall of the spray tower body is provided with the turnover filter layers. The filter layers are selectively arranged or closed, when the filter layers need to be selectively arranged, the adsorption filter layers of various models are simultaneously unfolded and arranged in the spray tower to realize adsorption and cleaning of dust particles, and when the filter layers do not need to be arranged, the plurality of filter layers are automatically hidden, so that the flowing fluency of waste gas is not influenced, and the working efficiency is improved; and the annular shielding flow guide structure is arranged insid