The invention provides a full-automatic rich washing method having a voice reminding function. The full-automatic rich washing method comprises the steps that agitating vanes rotate to stir rice to be washed and water; a concave rice scooping ladle turns over 90 degrees, and a water flow carries the rice into the concave surface; the concave rice scooping ladle carrying the rice grains to be washed upwards moves to the position mutually engaged with a rice washing board along a sliding way through a connecting shaft; the rice washing board moves back and forth to drive frictional convex head arrays to move on the rice grains back and forth; the concave rice scooping ladle performs 180-degree turnover to pour the rice grains into water when downwards moving again to a set descending position; the steps are repeated till the washing process is completed. By means of the full-automatic rich washing method, rice grains can be effectively washed, and the rice washing situation in a machine body can be also observed through a transparent machine cover.