A machining head with active correction of the type used in association with a robot to carry out fast high-precision machining tasks especially on parts for the aeronautical production industry that has localised position and angular sensors, and a machining motor or spindle provided with localised movement with respect to the head casing, independent of the robot's movement, this movement being preferably both displacement and rotation with respect to both, allowing active correction of the machining position is disclosed. The invention provides the main advantage of allowing errors by the robot or deformation of the part to be machined, in positioning for machining, to be corrected in a localised very fast and accurate way, without the need to re-position the robot.