The invention discloses a rotary spray reinforcement method of a super-deep silt stratum. The rotary spray reinforcement method comprises the following steps: (a) pile hole positioning; (b) componentassembling; (c) drilling rig in-place drilling; (d) pipe inserting; and (e) construction of a next pile hole. Construction is convenient, quick, reasonable and orderly, the application range is wide,the occupied area is small, vibration is less, noise is low, flexible adjustment can be achieved in the construction process, the construction quality is convenient to control, the construction cost is convenient to lower, the silt stratum is effectively reinforced, and the bearing capacity of the silt stratum is improved.