Solar cell focusing device

A solar cell focusing device, comprising:

• a concave section having a concave substrate and a concave reflective layer disposed atop the concave substrate;
• the concave reflective layer being made of a metal material selected from the group consisting of silver, aluminum, and chrome, and having a thickness larger than 100 nanometers;
• and the concave section being provided at a predetermined position with a through hole extending through the concave substrate and the concave reflective layer;
• and
• a convex section being disposed opposite to the concave section with a convex surface of the convex section facing toward a concave surface of the concave section;
• the convex section having a convex substrate and a convex reflective layer disposed atop the convex substrate;
• the convex reflective layer being made of a metal material selected from the group consisting of silver, aluminum, and chrome, and having a thickness larger than 100 nanometers;
• whereby sunlight projected onto the concave reflective layer is reflected onto the convex reflective layer and then reflected from the convex reflective layer again to pass through the through hole on the concave section and focus on a solar cell disposed behind the concave section.