The invention discloses a supporting method of a super-large section cutting hole of a large-mining-height fully mechanized mining face of a thin base rock. The supporting method comprises the following steps: carrying out primary supporting, wherein the primary supporting comprises first branch supporting and second branch supporting, the first branch supporting is supporting a tunnel by utilizing anchor rods and metal meshes after the cutting hole is tunneled primarily, and the second branch supporting is supporting the tunnel by utilizing anchor rods and a plastic mesh after the cutting hole is expanded secondarily; carrying out primary pressure releasing: after the primary supporting is finished, releasing surrounding rock stress at a moment first pre-set time interval before secondary supporting; carrying out the secondary supporting: after the cutting hole is completely molded, supporting by utilizing an arch rope and a high molecular material for the secondary supporting. According to the supporting method disclosed by the invention, the primary supporting is carried out in a tunneling process of a cutting hole tunnel; after the primary pressure releasing is carried out, the secondary supporting is carried out after the cutting hole tunnel is completely molded, and initiative supporting is carried out by phases; the integrity of a surrounding rock with the cutting hole is maintained, and accidents of roof fall and nicking are effectively prevented from occurring.