The invention relates to a method for manufacturing a solar energy battery board frame section bar, which comprises the following technical steps: adding an aluminum ingot into a smelting furnace to smelt and uniformly stirring aluminum liquid; after the aluminum liquid is stirred, carrying out first refinement; refining and uniformly scattering a slagging agent on aluminum slag; adding a magnesium ingot, aluminum-silicon medium alloy and rare earth alloy and fully stirring and mixing uniformly; carrying out second refinement and degassing; guiding refined aluminum liquid into a casting machine to cast; heating an aluminum bar on an aluminum bar heating furnace and extruding for molding on an extruder; and after the aluminum bar is extruded and molded, placing the aluminum bar into a heattreatment furnace to heat and preserve heat to obtain the solar energy battery board frame section bar. The section bar has bright surface, high strength, favorable toughness and corrosion resistance, lower manufacture cost and light weight, is difficult to deform, can be recycled and can save energy resources, reduce the environmental pollution and strengthen the running reliability.