Unloading system for gas field and process thereof

The invention provides an unloading system for gas field and a process thereof. The unloading system comprises an unloading region, a purification region and an unloading pond which are successively arranged, wherein a plurality of unloading slopes lower than the ground are arranged in the unloading region for parking conveying tank trolleys; a plurality of purification boxes are arranged in the purification region; a water collecting pit is formed in the unloading pond; the rest region is a mud collecting region; produced water is filtered and purified through a filter screen during unloadingto remove impurities such as furs and textiles, so that sewage entering the purification boxes is reduced; and meanwhile, the height of a baffle pipe is adjusted to block sludge on the outer side ofthe baffle pipe according to the impurity condition, and sludge entering the unloading pond is reduced by means of coarse separation of solid and liquid, so that the produced water entering the unloading pond is self-precipita