The invention relates to the technical field of high pressure jet grouting, in particular to a method of forming a high pressure jet grouting pile under the action of the tide. The method comprises the steps that the construction of the single high pressure jet grouting pile which can reinforce the foundation soil is divided into the construction of an I-section pile located below the normal waterlevel elevation and the construction of an II-section pile located above the normal water level elevation according to the tidal changes; the construction of the I-section pile is accomplished in therising tide period; and after the water surface elevation is reduced to be smaller than the normal water level elevation from the high tide level elevation in the falling tide period, and before thelow tide level rises to the normal water level in the next rising tide period, the construction of the II-section pile which is located in the range from the normal water level elevation to the designelevation is accomplished. The problem that cement grout flows away at the position above the normal water level elevation due to the tidal changes can be solved, the problems that the cement grout flows away at the position above the normal water level elevation due to the tidal changes, and the high pressure jet grouting pile forming quality is poor due to the loss of the cement grout are solved, the phenomenon that a large amount of cement grout flows away under the action of the tide is avoided, and the high pressure jet grouting pile forming quality is improved.