Tunnel monitoring and measuring method based on target identification

The invention provides a tunnel monitoring and measuring method based on target identification. Comprising the steps of installing a target and acquiring point cloud data; dividing the point cloud data into vault point cloud data and non-vault point cloud data; plane fitting is carried out on tunnel surface point cloud data in the vault point cloud data and the non-vault point cloud data; establishing a buffer area according to the fitting plane, and deleting the point cloud data in the buffer area; and carrying out clustering analysis on the reserved point cloud data to obtain a center coordinate of the target, and carrying out tunnel monitoring measurement. The targets are installed in the tunnel face and correspond to the measuring points one to one, the change of the positions of the measuring points can be obtained through the change of the positions of the targets, and the tunnel bias voltage monitoring device is suitable for monitoring the tunnel bias voltage condition; in addition, by establishing a b