The invention relates to the technical field of engineering construction, in particular to a horizontal directional drilling construction method for a high density polyethylene non-pressure pipeline. According to the method, underground pipeline detection is firstly carried out and comprises the steps of underground prospecting and ground measurement, detecting data are corrected, judged and comprehensively analyzed, and a detecting result is provided; according to the detecting result, a hole drilling track is determined, meanwhile, a directional guide drilling system is adopted for drilling a small-diameter guide hole according to the hole drilling track through electromagnetic wave signal transmission; and a large-diameter drill bit is connected to the end of a drilling rod in a replaced manner for repeated chambering, the to-be-paved pipeline is pulled into the specific position in the drilling hole while the last time of chambering is carried out, and pipeline paving construction is carried out. By means of the construction method, underground obstacles can be avoided in complex urban area construction, the pipeline can be paved in a non-excavation pipeline paving technology in some loose and broken stratums, and therefore the construction method plays an important role and has a great effect in city non-excavation construction.