Abstract: A method and device for monitoring a spark-eroding process in a spark-eroding machine, in which the impulse voltage curve is measured in the working gap and, when the actual voltage curve differs from a desired voltage curve, a control command is produced which changes the process data of the eroding machine. The voltage impulses are thereby, depending on the occurring ignition delay unit (t.sub.d), associated with different impulse groups which are each characterized by a pregiven ignition delay range. The impulses occurring in each impulse group are counted and a control command is produced when a pregiven limit number of successive impulses of one impulse group is exceeded indicating a process degeneration. The control command changes the process data of the eroding machine in the sense of a normalization of the process.