The invention discloses an environment-friendly building rubbish crushing and screening device which comprises a box body. A sliding plate is installed inside the box body, a screen is installed on the surface of an installing plate, a first crushing shaft is installed on the inner side of a bearing base, a second crushing shaft is installed at the position, on one side of the first crushing shaft, of the interior of the box body through the bearing base, crushing teeth are welded to the surfaces of the first crushing shaft and the second crushing shaft, a liquid conveying pipe is connected tothe top end of the interior of the box body, an atomizer is installed on the surface of the liquid conveying pipe, a motor is installed above an installing support, the output end of the motor is provided with a driving wheel through a rotating shaft, the surface of the driving wheel is connected with a driven wheel through a belt, and air hammers are installed at the two ends of the box body. The environment-friendly building rubbish crushing and screening device is provided with the motor, the first crushing shaft, the second crushing shaft, the crushing teeth, the screen, the air hammers,the atomizer, the liquid conveying pipe and a discharging cover structure, and the problems that the crushing efficiency is too low and the environment is polluted during crushing treatment are solved.