Slag separator used for filter press

The utility model discloses a slag separator used for a filter press. The slag separator used for the filter press comprises a filter, a filtering net and an on-off valve, wherein the filter is provided with a liquid inlet, a liquid outlet and a slag discharge port, the liquid outlet is not lower than the liquid inlet, the filtering net is arranged inside the filter and separates the inside of the filter into a first cavity and a second cavity, the liquid inlet and the slag discharge port are both directly communicated with the first cavity, the liquid outlet is directly communicated with the second cavity, and the on-off valve is arranged at the position of the slag discharge port and used for opening or closing the slag discharge port. According to the slag separator used for the filter press, the filtering net is arranged inside the filter, impurities flowing from the liquid inlet can be effectively stopped, and therefore the quality of discharged liquid is improved and meanwhile the operation efficiency of the filter press is greatly improved.