The invention discloses a river-crossing tunnel soil pressure sensor arrangement method, comprising the following steps that a, selecting qualified soil pressure sensors; b, manufacturing a soil pressure sensor arrangement board; c, installing an adjusting frame; d, installing an arrangement frame; e, installing the soil pressure sensors on the installation board; and f, welding the soil pressuresensors to a cutterhead. According to the invention, the soil pressure sensors can be uniformly welded in installation grooves of the cutterhead, the set heights of the soil pressure sensors in the same row or column are gradually reduced from the center of the cutterhead to the outer side, so that the soil pressure sensors are uniformly arranged on the cutterhead according to a certain height difference, meanwhile, the arrangement heights of the soil pressure sensors on the same circumference are the same, so that the obtained data can be compared, the accuracy of the detection data is improved, the arrangement positions of the soil pressure sensors can be horizontally adjusted and positioned, and the soil pressure sensors and the installation grooves of the cutterhead can be correspondingly arranged.