The utility model discloses a skid-mounted natural gas gathering and transportation device designed for achieving the purpose of miniaturization and skid mounting of a medium and low voltage gas gathering station and development of unattended operation remote automatic monitoring. The device consists of an inlet unit, a seperation unit, an external transportation pigging unit, an emptying pollution discharge unit and a self-use gas unit and mainly comprises a gathering pipeline connected with each single well pipeline, a pipe bundle type cyclone separator used for gas-liquid separation, a normal production external transportation line communicated with a check valve, a pigging operation line, a skid-mounted compression device, a flash evaporation seperation tank and the like, wherein the flash evaporation seperation tank is provided with a safety valve and a pollution discharge ball valve. The skid-mounted natural gas gathering and transportation device can realize the functions of gathering of gas from a natural gas single-well, gas-liquid seperation, emergency blow-down, emptying and pollution discharge liquid seperation, metering of external transportation, pigging and the like, and ensures that the separated natural gas does not contain free water and the burning gas of the torch does not liquid, thus the pollution to environments is reduced. The construction of a gas gathering station can be simplified to a technology butt joint of a gas gathering sledge and a skid-mounted compression device, so that the construction period is shortened, and the construction land is reduced. The skid-mounted natural gas gathering and transportation device efficiently integrates multiple functions of natural gas gathering, gas-liquid seperation, emergency blow-down, emptying and pollution discharge liquid seperation, metering of external transportation, pigging and the like according to a medium and low voltage gathering and transportation technology.