Water purifier without wastewater

The invention relates to the technical field of water purifiers and particularly relates to a water purifier without wastewater. The water purifier without wastewater comprises a pre-filter, a water inlet solenoid valve, a booster pump, a filter core mechanism and an RO film which are in turn connected through a pipe, wherein the pre-filter is connected with a raw water pipeline, a thick water outlet of the RO film is connected with a thick water outlet tube, a circulating pump is arranged on the thick water outlet tube, the outlet end of the thick water outlet tube is respectively connected with a thick water return tube and a domestic water pipeline, the outlet end of the thick water return tube is connected with the outlet end of the booster pump, and a check valve is arranged on the thick water return tube; a normally closed solenoid valve is arranged on the strong discharge protective pipeline; a bypass pipeline is arranged between the raw water pipeline and the domestic water pipeline; a water switch and a check valve are arranged on the bypass pipeline; and the water switch, a normally opened solenoid valve, the normally closed solenoid valve, the booster pump and the circulating pump are respectively electrically connected with an electric control device. By using the water purifier, the thick water cannot be discharged in the pure water production process so that the zero wastewater discharge function can be reached; and the thick water can be reasonably used when the domestic water is used.