The invention discloses an automatic-height-adjustment washstand, which comprises a washstand body. A water outlet mechanism is arranged on the washstand body and provided with first through holes, awater outlet
pipe base, a rotating head, a water outlet
pipe, a first waterproof sleeve, a
water flow control valve, a first telescopic
water pipe and a second telescopic
water pipe. A drainage mechanism is arranged on the washstand body and provided with an oval groove, a second through hole, a round ring, a water
retaining ring, a rotating rod, a second waterproof sleeve and a telescopic drainage
pipe. A lifting mechanism is arranged on the washstand body and comprises hydraulic cylinders, oil cylinders, oil inlet and outlet pipes, bidirectional electromagnetic valves, pistons, lifting vertical columns, connection plates, short vertical columns, retaining plates, hinges, open-close
doors, handles, vertical connection rods, slide grooves, a mirror, a first
infrared sensor, second infraredsensors and
infrared probes. A controller is arranged on the washstand body. The automatic-height-adjustment washstand has advantages of simple structure and high practicality.