The invention relates to a separation device for feces and sewage in a pig farm. The separation device comprises a shed frame and is characterized by further comprising an air window, a roller shutter, a windlass, all-directional wheels, rails, a feces scraping device and a sediment piston disc pump device, wherein the sediment piston disc pump device is used for conveying the sewage of the pig farm to a hardened ground of a sunlight greenhouse so that moisture in the feces is separated out, the moisture content is reduced and the time for drying the feces in the sun is shortened; the dried feces can be scraped out from the hardened ground by a feces scraping plate; a piston pump has an anti-blocking property, is convenient to use and high in mechanical efficiency, can be used for pumping plastic bags, small packaging boxes, bag sewing wires, semen deposition bottles and the like in the sewage of the pig farm and is not blocked; and the roller shutter is arranged at the periphery of the sunlight greenhouse and the temperature in the greenhouse is higher than that outside the greenhouse; and a moisture evaporating capability of the same area in the greenhouse is greater than that outside the greenhouse; and the aims of low manufacturing cost and high efficiency are realized.