The invention belongs to the technical field of heaters, and particularly relates to a cold and heat integrated heater. The cold and heat integrated heater comprises a shell, heating bodies, an inner barrel and a terminal box, wherein the shell is shaped like an octagonal prism, the lateral surface of the shell is provided with an inner layer and an outer layer, and a heat preservation layer is arranged between the inner layer and the outer layer; the surface of the outer layer is provided with heat radiation holes I; the end surfaces of the two ends of the space formed by the inner layer and the outer layer are provided with heat radiation holes II; the lateral surface of the shell is provided with an air inlet; the inner barrel is shaped like a hollow cylinder, is arranged in the inner layer of the shell and is coaxial with the shell; the two ends of the inner barrel penetrate out of the two ends of the shell; and the multiple heating bodies are all shaped like hollow cylinders and arranged on the inner barrel in a sleeving mode at equal intervals. The cold and heat integrated heater provided by the invention is good in heat preservation effect during heating, and reduces heat loss. Meanwhile, the outer layer is arranged for protection, so that the situation that people are scalded accidentally due to overheat of the surface of the heater is avoided. The outer layer of the shell is provided with the multiple heat radiation holes, rapid heat radiation is guaranteed, and the cold and heat integrated heater is safe, reliable, energy-saving and environmentally friendly.