The invention belongs to the technical field of building monitoring equipment, and discloses a BIM-based building data monitoring device, which comprises a monitor body, at least two groups of lifting assemblies, a positioning assembly and a rotating assembly, an outer protection frame is arranged outside the monitor body, the lifting assemblies are used for realizing lifting of the monitor body, and the positioning assembly is used for positioning the monitor body after the height of the monitor body is adjusted. The outer protection frame is additionally arranged, the monitor body is located in the outer protection frame when not in use, the monitor body can be effectively prevented from being collided and damaged, in addition, the rotating assembly is additionally arranged, when the monitoring direction of the moved-out monitor body needs to be changed, through the action of a first bearing, the monitor body can be directly rotated to change the direction, after the direction is changed, a first limiting rod penetrates through a placement plate to be embedded into a first limiting hole, the direction change is convenient and fast, and the whole device does not need to be moved.