The invention comprises a locking device and a locking method for the tool holder of a drilling system comprising a sleeve 10, a locking pin 9, a movement system 4/5/6, and a control system, wherein the sleeve 10 and the locking pin 9 are configured such that the sleeve 10 engages around the locking pin 9 with a form fit, such that the locking pin can be rotated in the sleeve about the longitudinal axis of the locking pin and, as a result, can be displaced laterally parallel to said longitudinal axis, and wherein the movement system has at least one electric motor 4 and at least one shaft 6, wherein the shaft 6 effects relative rotation of sleeve 10 and locking pin 9 by means of the force of the electric motor 4.