The invention relates to oil guiding cotton and particularly relates to the oil guiding cotton for electronic cigarettes and a preparation method for the oil guiding cotton. Raw material ingredients of the oil guiding cotton for the electronic cigarettes comprise plant charcoal micropowder, wherein the plant charcoal micropowder contains bamboo charcoal micropowder. The preparation method for the oil guiding cotton for the electronic cigarettes comprises the step of carrying out preparation by adopting the plant charcoal micropowder as a raw material, wherein the plant charcoal micropowder contains the bamboo charcoal micropowder. The oil guiding cotton for the electronic cigarettes, provided by the invention, has a micropore structure and a honeycomb structure, and the oil absorbency can reach 6 to 10 times that of the existing oil guiding cotton prepared from cotton fibers; the oil guiding cotton prepared by the method can faster absorb and release tobacco tar, so that an atomizer is effectively prevented from oil-free dry burning. Meanwhile, the oil guiding cotton provided by the invention has a bacteriostatic function, so that bacteria cannot survive for a long time and can disappear or be reduced in a short time.