Fine removal method for mercaptan organic sulfur

The invention discloses a method for finely removing mercaptan organic sulfur. The method comprises the following steps: filling tube passes of a plurality of reactors with a nano mercaptan hydrolysis catalyst; introducing to-be-purified natural gas containing mercaptan organic sulfur into the tube pass to generate hydrogen sulfide; wherein a plurality of open holes are formed in the tube pass, and gas in the tube pass flows into the shell pass of the reactor through the plurality of open holes; the desulfurization solution is introduced into the shell pass of each reactor and used for absorbing hydrogen sulfide, and purified natural gas is formed; purified natural gas flowing out of a natural gas outlet of the reactor is introduced into a dehydration device; and introducing the natural gas dehydrated by the dehydration device into a natural gas pipe network. The to-be-purified natural gas containing the mercaptan organic sulfur fully reacts with the nano mercaptan hydrolysis catalyst in the reactor, so that