The utility model provides a preformed helical messenger wire base, including preformed armor rods, rubber packing, metallic sheath and monaural. During the use, by rubber packing parcel carrier cable, preformed armor rods winding carrier cable and rubber packing, metallic sheath is located outmostly, hoists on contact net flat cantilever through the monaural at last. Compare with ordinary messenger wire base, the utility model discloses not only can protect the carrier cable effectively, outer outline level and smooth in addition makes corona discharge significantly reduce. Let the not influence of the bent stress of flexural, compressive stress of carrier cable simultaneously, make the carrier cable avoid fatigue breaking. The utility model discloses a be applicable to high -speed railway, inter -city railway, passenger -cargo each grade railway such as railway and dedicated line that thoughtlessly run, technical economy can be good, has the industrialization prospect.