Cabinet heat dissipation mechanism and cabinet system

The utility model discloses a cabinet heat dissipation mechanism and a cabinet system, the cabinet heat dissipation mechanism comprises an air supply assembly, the air supply assembly comprises an object placing piece and a fan, the object placing piece is internally provided with a through object placing cavity, the object placing cavity is communicated with the interior of a cabinet, and the fan is installed in the object placing cavity; and the protection assembly comprises an air cylinder, a supporting rod arranged in the air cylinder and a protection plate fixedly connected with the top end of the supporting rod, and the protection plate is located above the air supply assembly. In the using process, when heat in the cabinet reaches a certain threshold value, the air cylinder pushes the supporting rod to lift the protection plate, and the perforated partition plate and the draught fan are exposed, so that the heat dissipation effect is achieved, in addition, if the protection plate cannot be completely l