A portable industrial computer includes a host having an aperture located on a bottom side leading to the interior of the host and a movable heat dissipation panel pivotally coupled on the aperture in a movable manner to open or close the aperture. The movable heat dissipation panel has a top end extended outside the bottom side of the host and the aperture when the movable heat panel closes the aperture so when the portable industrial computer rested on a loading object generating a reaction force towards the interior of the host to push the movable heat dissipation panel to open the aperture for dispersing heat from the interior of the host. When the portable industrial computer removed from the loading object, the movable heat dissipation panel closes the aperture to prevent water or dust from entering the interior of the host avoiding damage.