The utility model relates to the technical field of rotary kilns, in particular to an energy-saving
rotary kiln. Comprising a
kiln body rotationally arranged on a plurality of supporting blocks, a feeding
pipe is arranged at one end of the
kiln body, a discharging bin is arranged at the other end of the
kiln body, the discharging bin and the feeding
pipe are fixedly communicated with the same gas guide
pipe, and the end, located in the discharging bin, of the gas guide pipe is fixedly communicated with a flow guide cover; a gas guide pipe is arranged in the kiln body, a fan and a filter box are arranged on the gas guide pipe, a plurality of
electromagnetic coil groups are fixedly arranged on the kiln body in a sleeving manner, an opening is formed in one side of the filter box, a rectangular frame is mounted in the filter box in a sliding manner, a
filter element is fixedly mounted in the rectangular frame, and a cover plate is arranged on one side of the rectangular frame. Through a simple locking structure, high-temperature
flue gas generated by the
rotary kiln can be conveniently and effectively filtered to remove dust, meanwhile, the filtered dust can be conveniently and rapidly cleaned, the problem of blockage of a
smoke exhaust pipeline can be effectively prevented, and recycling of preheated
flue gas is facilitated.