A laser guiding device for machine tools includes a casing, a circuit board and a laser module. The casing includes a base with a through-hole and a top cap covering the base. The circuit board is disposed on the base. The laser module is disposed on the base and electrically connected with the circuit board. The laser module is disposed corresponding to the through-hole of the base. An elastic body and a thread adjustment element are respectively disposed beneath and on the laser module and respectively abut against a bottom and a top of the laser module. Accordingly, the present invention can adjust the angle of the laser module via locking or releasing the thread adjustment element so that laser light is emitted along the correct direction.