The invention discloses a novel plug-in water cup device which comprises a water cup, a plug-in tip and a plug-in socket. The plug-in tip is connected with the water cup by a power wire, the plug-in socket is used with the plug-in tip, a handle is fixedly arranged on the end surface of the right side of the water cup, a plugging cavity is equally arranged at the front and the rear of the inside of the plug-in socket, a retraction groove is formed in the wall of the left end of the plug-in socket, a power transmission block is slidably mounted in the retraction groove, a first slide groove which is perforated through the plugging cavity is formed in the plug-in socket, a second slide groove which is elongated in the up-down direction is further formed in the plug-in socket and is particularly formed in the left side of the first slide groove, a first connecting groove is formed in a position between the first slide groove and the second slide groove, a second connecting groove is formed in a position between the second slide groove and the plugging cavity, a first slider is slidably mounted in the first slide groove in the up-down direction, a second slider is slidably mounted in the second slide groove in the up-down direction, toothed connecting strips are arranged on the end surfaces of the inner sides of the first slider and the second slider, a toothed connecting wheel is operationally mounted in the first connecting groove, penetrates the first slide groove and the second slide groove and is fittingly connected with the toothed connecting strips, and a partition plate is slidably mounted in the second connecting groove.