The invention relates to the technical field of building scaffolding, in particular to an external scaffolding bridging connector which comprises a male sleeve, a female sleeve, a fastener and a bolt. Each sleeve is composed of an upper section, a middle section and a lower section, each of the upper sections and the lower sections is a hollow round tube, lengths of the upper sections and the lower sections are 50cm, and the middle sections are solid columns. A male through hole matching with the bolt is arranged at the midpoint of the middle section of the male sleeve, a male flared opening is arranged on the right of the male through hole, a female through hole matching with the bolt is arranged at the midpoint of the middle section of the female sleeve, a female flared opening matching with the male flared opening is arranged on the left of the female through hole, and screw holes on the outer end side walls of the upper sections and the lower sections are in threaded connection with screws. The bolt sequentially penetrates through the female through hole and the male through hole to be connected with the fastener. In use, external scaffolding can be mounted and demounted only by means of screwing or unscrewing the screws, so that labor efficiency is improved, and labor intensity is reduced. The external scaffolding bridging connector has the advantages of simple structure, low production cost and the like.