The invention provides a device and method for acquiring morphology three-dimensional point cloud data of a TBM tunnel. The method comprises the following steps: step 1, before the TBM is started, locating all scanning devices on a girder; step 2, after a shutdown, starting the scanning devices to obtain three-dimensional point cloud data, and splicing the three-dimensional point cloud data obtained by each scanning device into a complete tunnel morphology; step 3, intercepting the obtained three-dimensional point cloud data into the length between the cross sections of the tunnel where two shutdowns are located; step 4, converting the three-dimensional point cloud data based on a pan/tilt rotating shaft coordinate system into three-dimensional point cloud data based on a geodetic coordinate system; step 5, storing the processed three-dimensional point cloud data in an industrial personal computer and splicing the three-dimensional point cloud data into the morphology three-dimensionalpoint cloud data of the excavated tunnel; and step 6, resetting the scanning devices, and waiting for the next scanning to start. According to the device and method in the invention, the problem thata TBM girder blocks scanning during construction is solved, and a high-precision tunnel morphology three-dimensional model is provided.