The invention discloses an environment-friendly building waste separating crushing device comprising a crushing box, a belt, an arc-shaped seat and a supporting bottom board. A feeding inlet is formedin one side of the upper end of the crushing box, and a crushing roller is arranged inside the crushing box; a connecting shaft is inserted in the middle of the crushing roller, and the other end ofthe connecting shaft is connected with a driven wheel arranged outside the crushing box; a supporting board is welded to the outer wall of the crushing box, and a crushing motor is arranged on the supporting board; a driving wheel is mounted at the rotating shaft end of the crushing motor and is in transmission connection with the driven wheel through the belt; a screen plate is mounted on the position, located below the crushing roller, inside the crushing box, and one side of the screen plate is connected with a guiding plate mounted on the outer wall of the crushing box; and the bottom endof the crushing box is connected with a spiral conveying cylinder, and a rotating rod is arranged inside the spiral conveying cylinder. The environment-friendly building waste separating crushing device is good in crushing effect and damping effect and high in environmental friendliness.