The invention discloses a mixing and stirring device with heating function. The mixing and stirring device comprises a rotary shaft and a stirring paddle, wherein the stirring paddle is connected with the rotary shaft through spokes; the rotary shaft, the spokes and the stirring paddle all have a hollow structure, and the hollow parts of the three are communicated; the upper end of the rotary shaft is an open end, and the lower end of the rotary shaft is a closed end; the stirring paddle is formed by serially connecting a plurality of blade units; the plurality of blade units are positioned between an upper round hollow pipe and a lower round hollow pipe; the upper and lower ends of the plurality of blade units are connected in series through the two round hollow pipes; the rotary shaft is positioned on the inner sides of the two round hollow pipes; the spokes are arranged between the two round hollow pipes and the rotary shaft; and an inner-circle hollow blade is arranged between each pair of upper and lower corresponding spokes. A stationary steam coil structure in a mixing container of the prior art is changed into a rotatable steam hollow blade of a central stirring shaft, so the temperature drop of the melt caused by a normal-temperature powder material can be quickly compensated, and composite slurry can be uniformly mixed.