The utility model relates to a combination system for removing mercaptan from a liquefied gas. The combination system comprises an amine liquid coalescence separator, a first-stage liquid film mercaptan removing reactor, a second-stage liquid film mercaptan removing reactor, a liquid film wash contactor, an oxidation separating tower, an alkaline liquor gas stripping tower, a disulphide tank, a tail gas wash alkali removing tank, a tail gas wash sulfur removing tank, a film separator and a tail gas oxidation sulfur removing tank. A liquefied gas fine filter is arranged between the amine liquid coalescence separator and the first-stage liquid film mercaptan removing reactor, the bottom of the first-stage liquid film mercaptan removing reactor is connected with a first-stage mercaptan removing separation tank through a flange, an alkaline liquor heat exchanger is arranged between the first-stage mercaptan removing separation tank and the oxidation separating tower, the first-stage mercaptan removing separation tank is connected with the second-stage liquid film mercaptan removing reactor through a first-stage liquid film mercaptan removing rear liquefied gas pipe, the lower portion of the second-stage liquid film mercaptan removing reactor is connected with a second-stage mercaptan removing separation tank through a flange, and the second-stage mercaptan removing separation tank is connected with the liquid film wash contactor. The combination system for removing the mercaptan from the liquefied gas has the advantages of being efficient, energy-saving, environment-friendly, low in operation cost and capable of reducing emission.