NOVELTY - Solar photovoltaic coating comprises four coating layers which are orderly sprayed and two leading-out electrodes, where first layer is based on reflection insulation coating of building outside wall and second layer is based on N-type semiconductor coating layer. The third layer is based on P-type semiconductor coating layer and the fourth layer is based on self-cleaning coating layer. The two electrodes are located between first, second, third and fourth coating layer.    USE - Solar photovoltaic coating used in buildings (claimed).    ADVANTAGE - The solar photovoltaic coating providse power to the load.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing solar photovoltaic coating, which involves:    (A) grinding N-type semiconductor and then adding water in the high speed disperser;    (B) adding wetting dispersant to the obtained material and then stirring the obtained material with electric conduction material;    (C) adding de-foaming agent, aqueous light curing resin, photo-initiator, flatting agent and other auxiliary agents;    (D) stirring the obtained material to obtain the dispersing uniformity of component II and N type semi-conductive coating;    (E) grinding P-type semiconductor and then adding water in the high speed disperser;    (F) adding wetting dispersant to the obtained material and then stirring the obtained material with electric conduction material;    (G) adding de-foaming agent, waterborne light-cured resin, photo-initiator, flatting agent and other auxiliary agent;    (H) stirring the obtained material to obtain a dispersion uniformity of the III and P-type semi-conductive coating;    (I) Adding water in the high speed disperser and then adding wetting dispersant;    (J) stirring the obtained material in and then adding de-foaming agent, waterborne light-cured resin, initiator, flatting agent and other auxiliary agents;    (K) stirring the obtained material to obtain a dispersion uniformity of the I reflective coating material;    (L) adding water in the high speed disperser and then adding wetting dispersant;    (M) stirring the obtained material and then adding coupling agent, modified 1200 meshes talcum powder, hydrophobic auxiliary agent, anatase titanium dioxide, de-foaming agent, waterborne light-cured resin, initiator, flatting agent and other auxiliary agent; and    (N) stirring the obtained material to obtain the dispersing uniformity of component IV and self-cleaning coating.