The invention provides a portable electronic case device which includes: a case, a surface treating part, a light source, a light lead part, an occulter and a preset pattern. The surface treating part connects with the case and covers the case. The light lead part has a photobiotic face and a diverging face showing preset one included angle each other, the photobiotic face is opposite to the light source position, and the diverging face is corresponding to the surface treating part. The screen and the preset pattern leans and covers the diverging face, and the preset pattern and the screen are relative set each other. When the light source provides a light energy to the light lead part, the light lead part centralizes the light energy to the preset pattern by using the screen for reflecting, and the light energy on the preset pattern is projected through the surface treating part and the case.