The invention provides a three-dimensional soil pressure cell complete set application device which comprises a telescopic guide rod screwed through a thread, a three-dimensional soil pressure cell fixing base, a connecting control, a three-dimensional soil pressure cell and a plurality of data wires, wherein the telescopic guide rod screwed through the thread and the three-dimensional soil pressure cell fixing base are connected through the connecting control; and a plurality of wires of the three-dimensional soil pressure cell are gathered into one data bus. The invention further provides animplementation method of the three-dimensional soil pressure cell complete set application device. The three-dimensional soil pressure cell complete set application device has the beneficial effectsof overcoming the defect that the buried angle and depth of the three-dimensional soil pressure cell cannot be determined during the site application process and realizing application of the three-dimensional soil pressure cell in original state soil mass testing. When the three-dimensional soil pressure cell complete set application device is applied in practical engineering, the precision of a testing result can be improved. With adoption of the implementation method of the three-dimensional soil pressure cell complete set application device, the time is saved and the construction efficiencyis improved.