The invention discloses a bridge plug combined staged fracturing stimulation method for an extra-thick coal bed in a vertical coal bed methane well. During fracturing modification of the extra-thick coal bed in the vertical coal bed methane well, the extra-thick coal bed is divided into a plurality of sections, and sectionalized perforation and bridge plug setting are performed for fracturing stimulation modification. The method comprises the steps of lowering a bridge and perforation combined tool string such as a positioner, a perforation gun, a quick drilling type composite bridge plug and the like to a design position, performing bridge plug setting and ignition perforation of the perforation gun by using an electronic multilevel control system, performing setting and perforation on the first section of the coal bed, pulling out the bridge and perforation combined tool string, performing fracturing stimulation modification on the first section of the coal bed through casing injection, and then performing blow-off in time; and after the construction of the first section is ended, lowering the bridge and perforation combined tool string again, performing setting and perforation on the second section, performing fracturing on the second section through casing injection, and performing blow-off; according to the process, performing fracturing stimulation modification on the third and fourth sections and the like; after the construction of all the sections is ended, performing plug drilling operation; and finally performing complementary perforation operation on the non-perforated sections.