The invention discloses a wastewater-free water purifier which can fully utilize wastewater (tail water) and truly achieve wastewater zero discharge. The wastewater-free water purifier comprises a source water inlet, a first manual mechanical valve, a first electrically-controlled one-way valve, a first pressurizing pump, a first-stage filter, a first water quality sensor, a second-stage filter, a second water quality sensor, a reverse osmosis membrane filter, a third water quality sensor, a purified water storage device, a first water level sensor, a purified water storage tank, a yielding water controller, a second electrically-controlled valve, a flowmeter, a purified water outlet, a third electrically-controlled valve, a second pressurizing pump, a second water level sensor, an ultraviolet disinfection lamp tube, a fourth water quality sensor, a wastewater treatment tank, a third pressurizing water pump, a fourth electrically-controlled one-way valve, a third water level sensor, a first pressure sensor, a high-pressure wastewater storage tank and the like. The high-pressure wastewater storage tank is additionally arranged and communicated with a water pipeline in a housing estate, and therefore the wastewater (tail water) generated in the purified water preparation process can be all effectively utilized.