Flash mounting support assembly and using method

The invention discloses a flash mounting support assembly which comprises two sets of guide rails, each guide rail is provided with an assembly, and each guide rail is provided with a side pressing unit and a middle pressing unit. The side pressing unit is connected with the guide rail and is used for fixing an assembly on the guide rail; and the medium-pressure unit is connected with the guide rail and is used for fixing the assembly on the guide rail. A photovoltaic support serves as a core component of a solar cell array supporting structure, and the performance condition of the photovoltaic support often determines safe and efficient operation and cost control of a photovoltaic system. The invention provides a support assembly which can be adjusted on site according to local latitude, wind load intensity and other factors and can achieve flash loading. The method has the advantages of being high in stability, short in construction period, capable of saving cost, capable of reducing labor intensity of oper