The reason why the existing water replenishing instrument is most likely to have quality problems is that the accumulated water at the atomizer mouth of the water replenishing instrument easily flows into the machine body, so that the components can no longer be used due to damage. Moreover, the switch design of the existing water replenishing instrument leads to the appearance of the water replenishing instrument being incomplete in the non-use state. Based on this situation, we have designed this separable water replenishing instrument, which can be divided into two parts: water tank, atomizer, battery and circuit board. The connection mode is through metal contacts. The start-up mode uses a full rotation mode, and the spray can be started when the head rotates 180 degrees, and the shape is complete when in use and after use. Nano - technology is adopted, and the sprayed fog is more exquisite and does not generate water drops.