Advanced support device for coal mine

The invention relates to the technical field of roadway support, and provides a coal mine advanced support device which is characterized by comprising a first protective net, first beams, a second protective net and second beams, the first beams are arranged on the two sides of the first protective net, and the first beams are used for being hung on a top plate of a coal mine roadway; the second protective net and the first protective net are arranged along the length direction of the first beam; the second beams are arranged on the two sides of the second protective net, the second beams and the first beams are connected in an inserted mode and are in sliding fit, the second protective net and the second beams are detachably connected, and the second beams and the first beams are detachably connected. By means of the technical scheme, the problems that in the related technology, the supporting area of an onboard temporary advance support is small, the expansion amount is not large, and full-section supportin