The invention provides a cup cover of a heating cup, and belongs to the technical field of household electrical appliances. The cup cover of the heating cup solves the technical problems that the exhaust velocity of a cup cover of an existing heating cup is slower, the using time of a spring is too long, so that the spring is loose, thereby a cover of a valve can not be reset to cause air leakage,and the stability of the use is worse. The cup cover of the heating cup comprises a main cover body, a venting through hole is formed in the main cover body, a hole opening of the venting through hole is fixedly provided with a columnar breather pipe, the venting through hole is internally provided with a plug made of silica gel, the lower portion of the plug is provided with a cone-shaped sealing part, the venting through hole is internally provided with a spring, under the action of the spring, the sealing part is pushed on an upper end port of the breather pipe to form the sealing. According to the cup cover of the heating cup, when the cone-shaped sealing part is jacked up by high pressure, the sealing part and the breather pipe form an annular gap, exhausting can be quickly conducted, a venting gap is also annular, food residues can not be retained, the sealing reliability of an exhaust structure is high, and the sanitary condition of long-term use is improved.