The utility model discloses a kind of pressing mechanism of automatic pressing pen, belong to automatic pressing pen field, including pen body and pressing rod;Driving ring, rotatably set in pen body;Elastic reset piece, set on driving ring;Buckle piece, set on elastic reset piece, plug-in part, set on pressing rod and can be slidably inserted into buckle piece and buckle piece and buckle in buckling;Buckle piece is used to limit plug-in part, to prevent pressing rod from appearing false touch, elastic reset piece is used to provide elastic tension for buckle piece, so that it maintains current state.The pressing mechanism of automatic pressing pen of the utility model, through the limiting design of buckle piece to plug-in part, effectively prevent pressing rod false touch, simultaneously using the cooperation of driving ring, elastic reset piece and other structures, release limiting when needed, ensure normal pressing function, compared with prior art, significantly improve the stability and reliability of pressing pen use.