Disclosed is a planar exterior forming square rack pipe, which comprises a rack pipe main body, a joint coupling protrusion part, and a plane forming member, and thus the outer surfaces of the planar exterior forming square rack pipes can be simply formed as a plane without operations such as the attachment of a separate member, such that the coupling of additional objects to the outer surface of the planar exterior forming square rack pipe such as the assembly of a planar panel, the mounting of a shock absorber, the mounting of a name plate, and the fastening of angles is simplified, assembly and mounting for the coupling of the additional objects can be completely carried out, and external foreign material such as dust can be blocked, and the rigidity of the exterior of the planar exterior forming square rack pipe can be reinforced relatively more than that of a conventional rack pipe having a curved shape so as to allow the rack pipe to be used as a pillar for supporting heavy materials or receiving a heavy load, thereby enabling stable support.
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