The invention discloses a construction method for swing-injected agitating composite piles. The construction method comprises the following steps of: putting a piling machine in place, and correcting levelness and perpendicularity of the piling machine; pulping, feeding pulp to the piling machine through a high-pressure pump; spraying pulp from a bottom pulp spraying hole of a swing-injected agitating composite drill bit on the piling machine, enabling the swing-injected agitating composite drill bit to agitate and submerge to designed pile bottom elevation, spraying pulp from the bottom pulp spraying hole of the swing-injected agitating composite drill bit on the piling machine, enabling the swing-injected agitating composite drill bit to agitate and lift to the designed pile bottom elevation, and sufficiently agitating a soil body by a first blade on the side wall of the swing-injected agitating composite drill bit; repeating steps 1) to 4) until construction of all swing-injected agitating composite piles is completed, wherein in a construction process, a jet grouting pile jets slurry to cut and damage the soil body under high pressure, and the first blade is utilized for sufficiently agitating the soil body, so that the soil body can be sufficiently mixed with pulp uniformly, and therefore, a phenomenon that jet-grouted solid is not uniform as range is affected by foreign matters when pulp cannot be jetted as a result of the foreign matters in the construction process of the jet grouting piles is avoided.