The invention discloses a novel medical cosmetology instrument which structurally comprises a water storage tank, indication lamps, an efficient water-replenishing cosmetology mechanism, a sliding plate, a sliding track, a discharge socket and a charge socket. According to the instrument, skin to be moisturized is covered by a nozzle, water vapor is kept as mist through atomization, then not onlyis the skin moisturized, but also a great deal of anion is generated and diffused into the environment around the skin, the anion is capable of affecting the reactive oxygen of the skin, the reactiveoxygen is deactivated, and thus an anti-aging effect can be achieved; firstly, the water storage tank is rotated rightwards to be opened, water replenishing products such as spray water are poured into the water storage tank, a columnar shell is inverted, the water storage tank is rotated rightwards to be locked, the sliding plate is moved downwards slightly on the sliding track, at the moment, afirst rack is driven to move upwards by a driven gear, a guide rod is risen together, then the spray water is fed into the columnar shell from an annular groove hole, water mist is ejected from the nozzle and is focused around the skin, and blood lymphatic return in the skin can be accelerated.