The invention discloses a multifunctional water cup which is characterized in that the outer side of a cup liner is hotly contacted with one side of a thermo-electric generation material; the other side of the thermo-electric generation material is in thermocontact with a radiating element; the thermo-electric generation material is used for generating electricity by utilizing the temperature difference of the two sides of the thermo-electric generation material; an output end of the thermo-electric generation material is in parallel connection with circuit phases such as a rechargeable battery and an output socket through a diode; a universal USB (universal serial bus) data line passes by the output socket, thereby supplying power to the small portable electric devices such as a mobile phone, a MP4 (mobile pentium 4), and the like. A function switch and a reversing switch are arranged in the circuit, thereby adding a refrigerating and heating function. By using the multifunctional water cup, the known defects that the heat of water is not utilized when the cup is used and the cup has no function of refrigerating and heating are solved. By using the multifunctional water cup, the heat energy of the hot water in the cup can be converted into electric energy, thereby environment-friendly generating and solving the problem that the small portable electric devices such as the mobile phone cannot be timely recharged during the travel time. The multifunctional water cup also has the function of refrigerating and heating. The multifunctional water cup provided by the invention can be used for producing drinking water, thermo-electrically generating, refrigerating and heating.