Step injection cooling tower

The invention relates to the technical field of cooling towers, in particular to a cascade injection cooling tower which comprises an inner barrel, an air barrel and a plurality of injection flow channels, and the injection flow channels comprise the first-stage injection flow channel, the second-stage injection flow channel and the third-stage injection flow channel; a first-stage ejection cavity is formed between the first-stage ejection flow channel and the inner cylinder, a second-stage ejection cavity is formed between the second-stage ejection flow channel and the first-stage ejection flow channel, a third-stage ejection cavity is formed between the third-stage ejection flow channel and the second-stage ejection flow channel, the output end of the third-stage ejection cavity is communicated with the air cylinder, and a first filler is arranged in the third-stage ejection cavity; a second filler is arranged in the inner cylinder; a liquid collecting pool is arranged below the inner ...