The present invention relates to a vehicle for constructing a streetlight which can perform post construction for the streetlight assembled in a factory and delivered to a site. The vehicle includes a crane device mounted to one side of a top portion; a post fastening unit installed to an end of a boom of the crane device and having a post clamping part pivoted by a clamping cylinder to clamp an outer circumference of the post of the streetlight; and a lower support, installed to a front side of the top portion, for supporting a lower portion of the post; and an upper support, installed to a rear side of the top portion, for supporting an upper portion of the post, and lifted by a lifting cylinder to enable the post to inclined at a desired inclined angle.
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