The invention discloses a construction method for a connecting part of PHC tubular piles, which is characterized in that: the circumferential positioning of two butted PHC tubular piles (8) on each layer is carried out through a connecting piece (7); and the inside and outside of a pipe wall of the connecting part of the PHC tubular piles (8) on each layer are grouted from the bottom up. The construction method for the connecting part of the PHC tubular piles ensures good connecting effect between the PHC tubular piles (8) and low cost.