Telescopic dust hood of trundle perforating machine

The utility model relates to the technical field of telescopic dust hoods and discloses a telescopic dust hood of a trundle perforating machine, which comprises an L-shaped base, a machining head bodyand a dust hood, the machining head body and the dust hood are arranged above the L-shaped base, the dust hood is positioned at the upper end of a drill bit, a first through hole is formed in the left side wall of the vertical part of the L-shaped base, and a hydraulic rod is fixedly connected in the first through hole. The left end of a piston rod of the hydraulic rod is fixedly connected with the right end of a machining head body, the output end of the machining head body is fixedly connected with a drill bit, the upper end of the machining head body is fixedly connected with a vertical fixing plate, a second through hole is formed in the right side wall of the fixing plate, and a movable rod is slidably connected into the second through hole. The left end and the right end of the movable rod extend out of the