Abstract: The present invention discloses a multifunctional knockdown rack structure, mainly comprising a main shaft and a plurality of inserting members, wherein the main shaft forms by stamping a plurality of ring edges at many sections on the surface of the tube member of the main shaft; the inserting member has an opening with a diameter slightly smaller than that of the tube member of the main shaft, and forms an interior hollow that exactly fits into the ring edge, and there are a blocking section and a supporting section respectively at the upper end and lower end of the interior hollow that fit into the tube member of the main shaft. The upper end and lower end respectively fit in the blocking section and the supporting section; such supporting section is coupled to the interior hollow having a anti-pressure section at an appropriate distance (this section is one empty section having no restrictions).