Underground drums are used to gather oil sludge and sewage of sulfur-containing natural gas processing plant at present. Two schemes for gathering oil sludge and sewage of sulfur-containing natural gas processing plant overground are proposed in view of underground drums’ potential safety hazard. One scheme is transferring amine preparation drum, MEG make-up drum, condensate sump drum, oil sludge collection drum, sewage collection drum from underground to ground under pressure. Alternatively, the above underground drums of sulfur-containing natural gas processing plant are all settled in the low-lying region, which implements the safety gathering of oil sludge and sewage with gravity flow and does not change the processing method. In addition, advantages and disadvantages of these gathering methods are analyzed and the scope of application is proposed. Gathering with gravity flow is applicable to newly-built processing plant and the conditions with terrain advantages to rely on, while gathering under pressure is applicable to reconstructed processing plant.