Pile cap construction method

The invention provides a pile cap construction method. The pile cap construction method comprises the following steps of cutting a protective layer of a pile head by a cutting ring, and cutting an annular cutting line on the pile head; the protective layer being a concrete layer covering an outer wall of the pile head; breaking the pile head along a gap of the annular cutting line, and stripping the reinforcing steel bar and the sounding pipe to separate the pile head from the pile foundation; straightening the pile top reinforcing steel bars or bending the pile top reinforcing steel bars according to angles; pile cap steel bars being bound and welded to the pile top steel bars to form a pile cap steel bar cage; a circulating pile cap former being installed on the periphery of the pile cap steel bar cage; concrete being poured into a pile casing body; and the circulating type pile cap former being dismantled to form a pile cap. According to the circulating pile cap forming device provided by the pile cap cons