Construction method for rotary excavation pile

The invention discloses a construction method for a rotary excavation pile. The construction method comprises the steps as follows: grouting a sleeve valve pipe to reinforce a soil layer around a rotary excavation pile body; and carrying out construction of the rotary excavation pile. According to the construction method, the sleeve valve pipe is grouted to reinforce a soil body around the rotary excavation pile before construction of the rotary excavation pile, so that the defect of a slurry breast wall adopted in the conventional construction of the rotary excavation pile is effectively overcome and the stability of the pile wall of the rotary excavation pile is high; and meanwhile, the construction operation of the rotary excavation pile can be carried out in an area with a large amount of soft soil layers and sandy gravel layers, the good quality can be guaranteed and the application range of construction of the rotary excavation pile is expanded.