The invention discloses a spray tower for industrial waste gas treatment and a spray method thereof. The spray tower comprises a tower base, a first tower body, a second tower body, a tower top, an exhaust pipe, a mounting plate, demisting plates, supporting plates, limiting plates, flow homogenizing plates, spray heads, water pumps, transverse pipes, water pipes, connecting pipes, spray headers,partition plates, guide plates, a chemical storage box, a water pump, communicating pipes, overflow pipes, a control cabinet, fans, a feeding door and an access door. The spray tower is simple in structure; a part of harmful substances and dust in waste gas can be removed through preliminary contact of the spray headers with the waste gas, so the dust removal effect of the spray tower can be improved; through the design of the communicating pipes, chemicals for removing harmful substances in the waste gas are conveniently sprayed; the problem that foam is generated when the chemicals and waterflow fall down and influences the work of the water pump is avoided through the design of the partition plates; through the design of the flow homogenizing plates, sprayed water flow and chemicals can uniformly flow in a filler; and through the design of the two spray heads, the problem that the phenomenon of wall flow occurs and influences purification effect is avoided.