The invention relates to polymer compound modified asphalt. The polymer compound modified asphalt is prepared from matrix asphalt, a modifier, an organic cooling agent, an antioxidant, a high-temperature viscosity reducer, a compatilizer and a stabilizer, wherein the modifier is a hydrogenated styrene-butadiene block copolymer. Compared with common cast modified asphalt, the polymer compound modified asphalt has the advantage that thermo-oxidative aging resistance and ultraviolet aging resistance of a binder are substantially improved on the premise that other performance indexes are unchanged obviously.