The invention relates to the technical field of surveying instruments, and discloses a surveying instrument for
engineering audit surveying, which comprises a three-legged synchronization mechanism, the bottom of the three-legged synchronization mechanism is provided with three telescopic three-legged supporting mechanisms, and the telescopic three-legged supporting mechanisms are arranged on the bottom of the three-legged synchronization mechanism. Angle locking mechanisms are arranged between the three-legged
synchronizing mechanism and the three telescopic three-legged supporting mechanisms, a storage
locking mechanism is arranged at the bottom of the three-legged
synchronizing mechanism and located among the three telescopic three-legged supporting mechanisms, and a recording supporting mechanism is arranged at the top of the three-legged
synchronizing mechanism. According to the surveying and mapping instrument for
engineering audit surveying and mapping, through the arrangement of the three-legged synchronizing mechanism, the telescopic three-legged supporting mechanisms, the angle
locking mechanism, the storage
locking mechanism and the recording supporting mechanism, the three telescopic three-legged supporting mechanisms which synchronously contract can be locked through the storage locking mechanism during storage, and the stability of the three telescopic three-legged supporting mechanisms is guaranteed; and therefore, the device is convenient to carry and carry.