Movable inclinometer and method for measuring deep horizontal displacement

The invention discloses a movable inclinometer and a method for deep horizontal displacement measurement. A foundation pit coordinate system is an XY axis perpendicular to and parallel to a foundation pit and a Z axis perpendicular to the XY axis; an inclination angle magnetometer and an inclinometer are mounted in the measuring rod, and the inclination angle magnetometer and the inclinometer both collect angle data and are in data communication interaction connection with an upper computer; in the single-section measuring distance L, the inclination angle magnetometer correspondingly measures the Z-axis rotation angle theta of the measuring rod relative to the Z axis, the inclinometer measures the X-axis inclination angle alpha and the Y-axis inclination angle beta of the measuring rod relative to the X axis and the Y axis respectively, and the upper computer receives the single-section measuring distance L, the X-axis inclination angle alpha, the Y-axis inclination angle beta and the Z-axis rotation angle t