The invention discloses graphene-polypyrrole composite aerogel and a preparation method and application thereof. The aerogel is mainly formed by compositing graphene and polypyrrole and has the advantages of being appropriate in pore diameter, large in porosity, high in specific surface area, low in density, good in electric conductivity of 0.1-100 S / m, high in energy storage modulus and the like. The preparation method of the aerogel comprises the steps that oxidized graphene and pyrrole monomers are taken as raw materials, the oxidized graphene is dispersed into uniform and stable dispersion liquid in an acidic or neutral environment, the oxidized graphene and the pyrrole are mixed evenly through mechanical stirring and ultrasound, standing is performed on gel at room temperature, and then drying is performed to obtain the graphene-polypyrrole composite aerogel. The aerogel obtained through the method is excellent in comprehensive performance, can serve as an electrode material of a supercapacitor, an adsorbing agent for aromatic organic dye and the like and is simple in preparation technology, low in energy consumption, green, environmentally friendly and suitable for mass production.