A transparent display panel and an electronic device are provided. The transparent display panel includes: a first substrate, a second substrate, and a liquid crystal layer therebetween, the second substrate having an edge extension portion located on a same side of the transparent display panel as a first light incident surface of the first substrate; a first light source assembly located on a side, where the first light incident surface is provided, of the first substrate; a first light guide bar located between the first light source assembly and the first light incident surface, the first light guide bar having a first light guide bar surface, a second light guide bar surface, and a first light guide bar slope surface therebetween, an inner angle formed between the first light guide bar slope surface and the second light guide bar surface being less than or equal to 90 degrees.