The invention discloses a seaside cleaning pig farm. The pig farm comprises at least one building built at the seaside, each building is shaped like a cylinder and is internally provided with two rows of pens which are built along the enclosing wall, and a trough which is shaped like a circular ring and is formed by splicing multiple sections of circular arc unit troughs and a water trough which is arranged along the spare enclosing wall foot in the building, wherein horizontal dregs discharge seams are formed in the inner ring side walls of the unit troughs, bottom plates of the unit troughs are movably arranged in the unit troughs, and one end of each bottom plate penetrates through the corresponding dregs discharge seam to extend out of the trough, and a water tank is arranged above the water trough. The seaside cleaning pig farm has the advantages that the trough is washed to be clean and not likely to collect dregs, toilet moving floor can divide and refine faeces, and the toilet floor can be completely cleaned up by being supported by simple spraying.