The invention relates to the technical field of educational software, and discloses a portable built-in educational software publicity display board mounting mechanism. The mounting mechanism comprises a positioning frame, wherein a limiting mechanism is fixedly connected to an upper wall of an inner cavity of the positioning frame, and a panel mechanism is slidably connected to the lower part of the inner cavity of the positioning frame; transition mechanisms are movably connected to the middles of left and right side wall cavities of the panel mechanism, and triggering mechanisms are movably connected to the sides, close to the limiting mechanisms, of the left and right side wall cavities of the panel mechanism. According to the portable built-in education software publicity display board mounting mechanism, a wedge-shaped abutting rod is limited through a movable ring and a bowl-shaped block, so a display board is difficult to naturally separate from a positioning frame, a ratchet plate is driven to move when the display board is pressed, a lifting plate extends out, and a synchronous air pressure bag is extruded to exhaust airflow to blow dust on the periphery of the lifting plate; and therefore, convenience and stability of equipment installation are greatly improved, and the situation that hands are dirty when the equipment is replaced is avoided.