The invention discloses a high-efficiency grading, screening and cleaning device for building sand and gravel, which includes a feed pipe, a grid, a liquid level gauge, a box body, a water inlet pipe, a flow meter, a nozzle, a rotating shaft, a camera, a timer, an impeller, a sieve plate and Vibrator, coarse sand discharge pipe and fine sand discharge pipe, the top of the box is provided with a feed pipe, the inside of the feed pipe is inclined with a grid, the lowest end of the grid is provided with an impurity discharge pipe, and the box is provided with a Liquid level gauge, the box is connected with the water inlet pipe, the outlet end of the water inlet pipe is provided with a nozzle, the flowmeter is installed on the water inlet pipe, the inner wall of the top of the box is equipped with a camera, the box is equipped with a rotating shaft, and an impeller is installed on the rotating shaft. There is a sieve plate, a vibrator is arranged on the lower surface of the sieve plate, and the sieve plate includes a first sieve plate and a second sieve plate. The invention screens sand and gravel, improves work efficiency, saves time and labor, has simple structure, is convenient to use, and is beneficial to popularization.