The invention belongs to the technical field of carbonizing equipment and particularly relates to a low-energy-consumption straw carbonizing apparatus, comprising a carbonizing tank; an automatic reeling barrel is fixedly mounted on the outer surface of one side of the carbonizing tank; a feeding box is fixedly mounted at the outer bottom of the automatic reeling barrel; a reeling motor is fixedlymounted on the outer surface of the lower end of the automatic reeling barrel; a rotary shaft rod is rotationally mounted on the inner surface of the automatic reeling barrel; the outer surface of the rotary shaft rod is provided with a reeling thread. With the automatic reeling barrel, the feeding box, the reeling motor, the rotary shaft rod, the reeling thread, a stirring motor, a stirring shaft rod and a stirring rotary rod, the low-energy-consumption straw carbonizing apparatus can automatically feed straws; labor intensity is reduced for operators; straw carbonizing efficiency is improved. Straws can be stirred continuously, so that the straws are more evenly heated during heating. The low-energy-consumption straw carbonizing apparatus has certain practicality and has a better application prospect.