Drill rod detection method, automatic drilling depth measurement method and system and drilling machine

The invention relates to a drill rod detection method, an automatic drilling depth measurement method and system and a drilling machine, and relates to the field of drilling engineering. The measurement method comprises the steps that whether a drill rod exists at an orifice or not is detected; whether an added driven drill rod is hoisted or not is judged by measuring the tension of a steel wire rope; when it is detected that the drill rod exists at the orifice and the driven drill rod is hoisted, a steel wire rope encoder is started and is used for detecting the advancing length of the steel wire rope passing through the steel wire rope encoder; when it is detected that the drill rod does not exists at the orifice, the steel wire rope encoder is stopped, and length measurement information measured by the steel wire rope encoder in the process from starting to stopping is fed back; and the length measurement information is matched with drill rod length information in a preset drill rod database, and the drill