The invention discloses an insulating and heat-isolating dual-purpose cup which comprises a liner and an outer barrel. The liner is prepared from an insulating material or is of an interlayer structure. An accessory liner opened in the upper part and closed in the lower part is fixedly connected to the bottom of the liner hermetically in a fit manner. The accessory liner comprises a base preparedfrom a poor conductor of heat and a heat-dissipating barrel prepared from a metal material. The outer diameter of the heat-dissipating barrel is smaller than that of the liner and the height ratio ofthe heat-dissipating barrel and the liner is 1: (3-5). Outer threads are formed out of the liner and the base. An upper cover is arranged on the upper part of the liner. The outer barrel comprises a first barrel and a second barrel which are cylindrical. The first barrel is prepared from the insulating material and the second barrel is prepared from a plastic. A plurality of heat-dissipating holesare densely formed in the second barrel. The first barrel and the second barrel are same in height. The first and second barrels have inner threads. The inner threads and the outer threads are matched. The insulating and heat-isolating dual-purpose cup has the advantages that the insulating and heat-isolating dual-purpose cup is dual-purpose and is relatively convenient to use.