NOVELTY - A Claus hydrogen sulfide elimination method for offshore platform natural gas seawater is performed by entering hydrogen sulfide-containing natural gas from bottom of desulfurizer loaded with catalyst packing at speed of 2-10 m/second and at tower bottom pressure of 0.5-2 MPa and removing hydrogen sulfide; mixing circulated seawater with amount of fresh seawater and entering from top of desulfurizer loaded with catalyst packing; and performing Claus reaction with hydrogen sulfide-containing natural gas on the packing and removing the hydrogen sulfide.    USE - Claus hydrogen sulfide elimination method for offshore platform natural gas seawater (claimed).    ADVANTAGE - The method does not recover sulfur, but discharges in form of sulfate, which is adaptive to specific isolation environment of offshore platform. Further, the method has small investment, is easy to operate, involves mild reaction condition, and provides excellent desulfurizing effect.    DETAILED DESCRIPTION - A Claus hydrogen sulfide elimination method for offshore platform natural gas seawater, comprises:    (A) utilizing a device comprising a desulfurizer filled with catalyst packing, an oxidation tower, a gas mixer, a liquid distributor and an aeration recovery tank and applying natural gas Claus hydrogen sulfide elimination, where natural gas contains (mass%) methane (72-77), carbon dioxide (12-15), water (12-16), and nitrogen (5.5-6.5), and hydrogen sulfide (20000-50000 mg/m3);    (B) entering hydrogen sulfide-containing natural gas from bottom of desulfurizer loaded with catalyst packing at speed of 2-10 m/second and tower bottom pressure of 0.5-2 MPa, and entering to desulfurizer at reduced tower pressure of 0.02-0.04 MPa and temperature of 25-45 degrees C and removing the hydrogen sulfide;    (C) mixing the circulated seawater from circulated fluids distributor with amount of fresh seawater, and entering from top of desulfurizer loaded with catalyst packing, and performing Claus reaction with hydrogen sulfide-containing natural gas on the packing and removing the hydrogen sulfide to generate sulfur-containing product;    (D) demisting the hydrogen sulfide-removed natural gas through a mist catcher, entering to turbine to generate electricity, outflowing generated sulfur-containing product from bottom of desulfurizer along with circulated seawater and then entering into top of oxidation tower loaded with catalyst packing, and entering the desulfurizer at reduced tower pressure of 0.03-0.05 MPa and temperature of 25-45 degrees C;    (E) entering ozone/air gas mixture from a premixer to bottom of the desulfurizer loaded with catalyst packing, performing oxidizing reaction with the sulfur-containing circulated seawater on the packing, generating sulfur-containing product, and recovering the seawater; and    (F) outflowing recovered circulated seawater from bottom of oxidation tower, entering into cycling liquid distributor, ensuring the flow rate of circulated seawater returning the desulfurizer, entering excess circulated seawater into an aeration recovery tank, sufficiently aerating with air from the top of the oxidation tower, mixing with fresh seawater, and adjusting pH value and chemical oxygen demand to meet sea area discharge standard.