The invention discloses wet desulphurization and dust removal equipment for industrial waste gas and a use method thereof, and belongs to the technical field of industrial waste gas desulfurization. The equipment includes an outer cylinder, wherein a support is fixedly mounted below the outer side of the outer cylinder, and supporting legs are fixed below the support. According to the equipment and the use method thereof, the contact area with limestone water is increased, the reaction efficiency is improved, internal water backflow is prevented, the situation that gas rises too fast and cannot make contact with a spraying device is prevented, the contact time is prolonged, the treatment efficiency is improved, and the limestone water sprayed out of a spray head makes full contact with the gas, thus improving the desulphurization effect, forming a wet desulphurization cycle, increasing the utilization efficiency, reducing the waste of resources, preventing condensate water residues inside, avoiding secondary pollution caused by long-time residues, improving the condensation conveying efficiency, strictly controlling the gas emission quality, protecting the environment from being polluted, improving the desulphurization quality, reducing the waste of heat energy and increasing the treatment benefits.