NOVELTY - High-power concentration photovoltaic system receiver protective film, is claimed. The protective film is an aluminum oxide thin film placed on outer surface of a receiver by atomic layer deposition, where the receiver includes a copper coated ceramic plate, a solar cell, a Schottky diode, a gold wire and other components, and the protective film outer surface is in contact with air.    USE - Used as a high-power concentration photovoltaic system receiver protective film.    ADVANTAGE - The protective film: is water-proof; and has insulative property, anti-oxidation function and good thermal conductivity.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing protective film, comprising: (a) placing the high-concentration photovoltaic system receiver in the sample holder of a atom layer deposition device vacuum chamber, where the vacuum of the chamber is maintained at 600-800 Pa, and the chamber is present at room temperature; (b) introducing metal organic precursor trimethyl aluminum into a vacuum chamber, allowing the receiver to adsorb metal-organic precursors on its surface at an adsorption reaction time of 0.1-0.3 seconds, and purging nitrogen into the vacuum chamber for 1-2 seconds; (c) introducing a second precursor vapor stream on the receiver, further oxidizing into aluminum oxide for a controlled surface oxidation reaction time of 0.2-0.4 seconds, purging nitrogen into the vacuum chamber for 2 seconds, and completing the atomic layer growth of the film when the atomic layer thickness is 0.1-0.2 nm; (d) repeating steps (b) and (c), where after the multi-deposition growth cycle, the receiver on the atomic layer is uniformly formed on the surface of the aluminum oxide thin with a thickness of 30-100 nm; and (e) annealing the layer at a pressure of 30 Pa, temperature of 120 degrees C under argon gas atmosphere for 20 minutes.    DESCRIPTION OF DRAWING(S) - The figure illustrates a schematic representation of the high-power concentration photovoltaic system receiver protective film.