The invention relates to a fixing device for a soil pressure gauge. The device is characterized by comprising two vertically arranged fixation rods arranged at an interval. A plurality of horizontal or vertical fixation rings used for placing the soil pressure gauge are arranged between the two fixation rods at intervals. According to the technical scheme of the invention, the embedding location of the soil pressure gauge can be accurately positioned, so that the measurement accuracy is improved. The soil pressure gauge can be used repeatedly. The fixation rings of the fixing device can be horizontally arranged on the two fixation rods, so that the data of the vertical soil pressure around pile legs during the pile inserting process can be measured. The fixation rings of the device can also be vertically arranged on the two fixation rods, so that the data of the radial soil pressure and the data of the tangential soil pressure around pile legs during the pile inserting process can be measured. At the same time, since the thickness of the fixation rings is smaller than the thickness of the soil pressure gauge, the soil pressure gauge is in close contact with the surrounding soil. Therefore, the measurement accuracy is improved.