The invention discloses a water cup which comprises the water cup, a plug connected with the water cup through a lead and a socket connected with the plug in a matching manner; the water cup consists of a cup body, a cup cover arranged at the top of the cup body, a cup nozzle formed above the end surface of the left side of the cup body and a cup handle arranged on the right side surface of the cup body; inserting cavities which are vertically symmetrical and of which through holes are rightward are formed in the socket; placing troughs transversely extending are also formed in the socket; power supply pins electrically connected with commercial power are fixedly mounted on the end surfaces, close to the inserting cavities, of the placing troughs; gaps are formed in each of the power supply pins; left pushing troughs and right pushing troughs of which through holes face to the inserting cavities as well as fixed connection troughs positioned between the left pushing troughs and the right pushing troughs are also formed in the socket.