The invention relates to the technical field of cable equipment maintenance tools, in particular to a portable fall preventing device. The portable fall preventing device comprises an insulation fixedrod, insulation support rods, a fixing device and a lifting ring fixing device; at least one insulation support rod is arranged above the insulation fixed rod; the insulation support rods can enter an inner cavity of the insulation fixed rod; and the upper end of the insulation fixed rod is fixedly mounted with the lower ends of the insulation support rods. The portable fall preventing device isreasonable and compact in structure and convenient to use; and through cooperative use of the insulation fixed rod, the insulation support rods, the fixing device and the lifting ring fixing device, the portable fall preventing device is firmly fixed on such equipment as a concrete electric pole, so that firm and reliable hanging and buckling points are provided for climbing in electric maintenance, the high-altitude falling danger of operators is prevented, the working efficiency of the maintenance operation is improved, the power failure time of users is shortened, and the personal safety ofoperators is effectively guaranteed.