When the dual-axis inclinometer is used in combination with other position and orientation measurement sensors, since the true direction of its own coordinate axis cannot be accurately mapped by the mechanical enclosure, it is difficult to achieve accurate calibration of the installation position error, which leads to the problem of measurement error. The object of the study is the dual-camera target of the linear pipe jacking machine guidance. The theoretical value of the attitude angle is obtained by three points pose transformation algorithm, and then combined with the angle measurement value of the dual-axis inclinometer to establish an error compensation matrix, which is used to correct the pose parameters. Through simulation analysis and actual measurement experiments, the proposed method can realize the accurate compensation of the measurement angle information of the dual-axis inclinometer, and the absolute measurement accuracy of the attitude angle is better than 0. 02°, which meets the accuracy requirements of the linear pipe jacking guidance. It can be widely used in other combined measurement systems based on dual-axis inclinometer.