The invention discloses an inverted organic light emission diode, a preparation method thereof, a display screen and a terminal. The inverted organic light emission diode comprises a substrate, a cathode layer, an organic function layer and an anode layer serving as a light-emitting surface, which are sequentially in stack combination. The organic function layer comprises a light-emitting layer which emits light when driven by an external power supply; and the cathode layer comprises a semipermeable metal layer, a diffuse reflection layer and a metal reflection layer which are sequentially in stack combination, wherein the semipermeable metal layer is in stack combination with the organic function layer; the metal reflection layer is in stack combination with the substrate layer; and the material of the diffuse reflection layer is the oxide of the material of the metal reflection layer. The inverted organic light emission diode has low reflectivity and high contrast. The display screen comprising the inverted organic light emission diode and the terminal provided with the display screen have high contrast, and displayed pictures are clear.