The invention discloses a pressure composite cement eolian deposit mortar mixing pile pile-forming process. The process comprise the following steps that firstly, a pressure pump is mounted on mixingpile pile driving equipment, the height of a pile driving equipment guiding frame is decreased, and the height of the guiding frame is decreased from 20 meters to 2 meters or below; secondly, the pressure pump is connected with a material collection hopper, and after grout in the material collection hopper flows into the pressure pump, the pressure of the pressure pump is set according to the grouting depth; and thirdly, a flowmeter is additionally arranged at an outlet of the pressure pump, according to types of soil samples, the pumping pressure is adjusted, the pump output per unit time iscalculated, and the compactness required by engineering design is reached by recording and adjusting data of the flowmeter. Through the process, mixing pile equipment is improved, the pressure pump device is additionally arranged, the height of the guiding frame can be decreased from 20 meters to 2 meters, and the convenience of the equipment is greatly improved. Coal ash is added into cement grout, the construction cost is greatly reduced, the peaceability of grout is improved, grout can pass through a conveying pipeline conveniently, and construction is facilitated.