Village and town sewage centralized innocent treatment system

The invention provides a village and town sewage centralized innocent treatment system, which comprises a solar thermal collector, a heat exchanger, a coarse screen well, a stirring well and a fine screen well which are communicated in sequence; wherein a water outlet of the fine screen well is communicated with an air floatation tank, a sludge outlet of the fine screen well is communicated with a sludge-water separator, the fine screen well comprises an obliquely-arranged fine screen, and a squeezer is arranged on the upper portion of the fine screen; the air floatation tank, the adjusting tank, the purification tank and the water storage tank are sequentially communicated, the mud-water separator, the aerobic fermentation tank, the condenser and the deodorization tower are sequentially communicated, the aerobic fermentation tank comprises a plurality of fermentation tank bodies which are stacked and communicated, a pile turning device is arranged in each fermentation tank body, and the aerobic fermentation