The invention discloses a waste gas spray tower with tail gas purification treatment, the waste gas spray tower comprises a treatment tower, a feeding box, a connecting pipe, a purification tower and a wastewater tank, the top of the treatment tower is provided with the connecting pipe, one end of the connecting pipe is provided with the purification tower, the outer wall of one side of the treatment tower is provided with the feeding box, the waste water tank is mounted on the outer wall of the other side of the treatment tower, absorbent cotton is mounted on the inner wall of the treatment tower, a protective shell is mounted on the inner wall of the purification tower, and a purification groove is formed in the bottom wall in the waste water tank. Waste gas can be completely purified by installing a plurality of water pumps and spraying pipes, the waste gas moves upwards to meet the first purification block, the first water pump drives purification liquid in the first box to be sprayed out from the first spraying pipe, and the waste gas passing through the first purification block is purified for the first time; a second water pump pumps the liquid medicine in the second box to a second spraying pipe, and then the liquid medicine is sprayed out of the second spraying pipe, so that the waste gas is purified for the second time, and the function of purifying the waste gas is achieved.