Low-dynamic level/azimuth online measurement device and measurement method

The invention relates to a low-dynamic level/azimuth online measurement device and measurement method. The measurement device comprises a detection imaging unit used for detecting and imaging the level/azimuth, an information processing unit used for performing image collecting and image processing on imaging information of the detection imaging unit so as to obtain the level/azimuth, a display used for displaying the level/azimuth measurement result, and a keyboard used for performing control and inputting the information. The detection imaging unit comprises a stable target unit used for keeping spatial angles stable under a low dynamic condition, a target imaging unit arranged over the stable target unit and used for shooting detection state information of the stable target unit, and a connecting piece used for fixedly connecting the stable target unit and the target imaging unit. The low-dynamic level/azimuth online measurement device and measurement method solve the problems about object level/azimuth stage change monitoring and large structure deformation measurement under a low dynamic condition.