The invention relates to an installation method of a frameless BIPV (building integrated photovoltaics) solar energy assembly. In the method, a first installation section bar, a second section bar, a frameless solar energy assembly, a weather-resistance sealing washer and bolts are utilized, wherein the frameless solar energy assembly comprises super white toughened glass, EVA (ethylene vinyl acetate), a monocrystalline silicon cell sheet, leads, a connector, a junction box and a TPT (tedlar / PET / tedlar) backing plate; the super white toughened glass is provided with a mounting hole; the positions, which correspond to the mounting hole of the super white toughened glass, on the first installation section bar and the second installation section bar, are provided with mounting holes; and thefirst installation section bar is provided with a lead path hole. Compared with the prior art, the invention has the advantages of good tightness, beautiful appearance and the like.