Domestic sewage treatment device for ships

The invention discloses a domestic sewage treatment device for a ship, and relates to the technical field of sewage treatment.The domestic sewage treatment device comprises a ship cabin, a filtering assembly and a sewage box, the bottom end of the ship cabin is connected with a water inlet assembly, the tail end of the water inlet assembly is provided with a filtering box, the filtering assembly is arranged on the inner side of the filtering box, and the bottom end of the filtering assembly is connected with a sewage discharging pipe; the dirt box is connected to the tail end of the blow-off pipe, and the left side of the bottom of the filter box is connected with a purification box. According to the invention, after water in the siphon box is discharged, a formed space can form a vacuum shape, at the moment, all valves at the outer end of the siphon box are in a closed state, siphon force generated by vacuum can be transmitted into the blow-off pipe through the siphon, and due to the fact that the blow-off p