The invention provides a mixer heating apparatus, and relates to the technical field of mixing and heating. The purpose of the invention is to solve the technical problem of unsatisfactory mixing effect caused by uneven material heating due to single arrangement of a heating device in a mixer in the prior art. The mixer heating apparatus comprises a shell and a stirring device, the shell is provided with a material accommodating cavity, and stirring blades of the stirring device are arranged in the material accommodating cavity; a first heating device and a second heating device are sequentially arranged between the shell and the peripheral side of the stirring area of the stirring blades, and a third heating device capable of heating the sidewall of the shell is arranged outside the shell; and gaps are formed between the shell and the inner wall of the first heating device, between the first heating device and the second heating device and between the second heating device and the stirring blades.