Flame-retardant PVC (polyvinyl chloride) plastic threading pipe

The flame-retardant PVC plastic threading pipe comprises an incomplete outer sleeve, an adjusting assembly and an opening and closing type inner sealing pipe, an opening is formed in the incomplete outer sleeve in the axial direction, the incomplete outer sleeve comprises cavity sections and a closed section, the cavity sections of the incomplete outer sleeve are arranged at the two ends of the closed section, and the adjusting assembly is arranged in the opening and closing type inner sealing pipe. The cavity section of the incomplete outer sleeve is communicated with the opening, the opening and closing type inner sealing pipe is arranged in the incomplete outer sleeve in a sliding mode, the adjusting assembly comprises a gear ring and a driving gear, and the gear ring is arranged on the opening and closing type inner sealing pipe; the invention belongs to the field of threading pipes, and particularly relates to a threading pipe capable of being opened and closed to facilitate rapid threading and wiring, o