Telescopic tunnel excavation operation rack

The utility model aims to provide a telescopic tunnel excavation operation rack, which belongs to the technical field of tunnel construction and comprises a plurality of first gantries which are arranged in parallel, a second gantry is arranged at the top ends of the first gantries, each first gantry comprises two first telescopic upright posts which are parallel to each other, each first upright post comprises a first hollow steel pipe, and each first hollow steel pipe is provided with a second hollow steel pipe. A steel pipe is arranged in the first hollow steel pipe, a plurality of positioning holes used for adjusting the height are formed in the surfaces of the first hollow steel pipe and the steel pipe, the top ends of the first stand columns are connected through a first cross beam, a telescopic cross rod is arranged on one side of the top end of each first stand column and comprises a second hollow steel pipe, and a steel pipe is arranged in each second hollow steel pipe. The utility model is quickly s