The invention discloses a natural gas filtering, metering, dehydration and demercuration module. The natural gas filtering, metering, dehydration and demercuration module comprises a raw gas inlet filter, a raw gas heat exchanger, two molecular sieve adsorption towers, a demercuration bed, a demercuration filter, a raw gas inlet buffer tank, an inlet gas water separator, a regeneration gas heater,a regeneration gas water separator and a regeneration gas cooler. According to the natural gas filtering, metering, dehydration and demercuration module, a process system is optimized, part of redundancy design is removed, the system complexity and cost are reduced, the number of equipment is reduced, moreover, the module is highly integrated skid-mounted through optimization of the process system, so that the occupied area is reduced, and the production, transportation and field installation of the module are facilitated.