The invention discloses a demolished building garbage sorting system and method. The demolished building garbage sorting system is characterized in that a continuous feeding system, a pretreating system, a first screening-desliming device, a wind separating device, an intelligent impurity removing system, an impact crusher, a second screening device, a recycled aggregate washing-separating systemand a third screening-desliming device are sequentially connected; the first screening-desliming device, a primary settling device, a fine sand recycling device, a horizontal-flow settling device, a filter and a water circulating device are sequentially connected so as to form a circulating loop I; the recycled aggregate washing-separating system, the primary settling device, the fine sand recycling device, the horizontal-flow settling device, the filter and the water circulating device are sequentially connected so as to form a circulating loop II; and the third screening-desliming device, the primary settling device, the fine sand recycling device, the horizontal-flow settling device, the filter and the water circulating device are sequentially connected so as to form a circulating loopIII. Through the separating treatment of demolished building garbage, high-purity aggregate products and a recycled sand product can be separated, and the demolished building garbage comprehensive-treatment level can be improved.