The present invention relates to an automatic air-blowing apparatus for removal of a remaining metal-working fluid and weld-slag in a rectangular steel pipe, wherein in accordance with difference of a size, an outer diameter, a thickness, a length, or the like of a rectangular steel pipe, a blower pivots to perform blowing for a change in a production speed or a transfer speed. Therefore, without productivity of a continuous pipe making process or a production speed, the remaining metal-working fluid and the weld-slag in the rectangular steel pipe can be effectively and efficiently removed by automation during line transfer, and further, a strong large blower is adopted to completely remove the remaining metal-working fluid and the weld-slag in the rectangular steel pipe.
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