The invention provides a feeding, dosing and automatic diluting method for a large periphery-drive efficient thickener. The feeding, dosing and automatic diluting method comprises the following steps: using a slurry feeding tube to feed in a manner vertical to the liquid surface of the thickener, and dosing above a central barrel, wherein the central barrel wall is uniformly provided with a diluting window towards the circle center at the circumference surface, so that automatic diluting for ore pulp is achieved. Through the feeding, dosing and automatic diluting method, the thickener is quick in slime clustering and settling rate, stable in compression layer, high in underflow density, and high in water returning rate and good in water returning quality, so that production capacity in ore washing is improved, unit consumption in water and power during production is reduced, the production is ensured to be continuous and stable, and the application effect is remarkable. The feeding, dosing and automatic diluting method has such advantages of being simple in structure, low in manufacturing cost, remarkable in effect, stable in operation, convenient to popularize among efficient thickeners of the same type and the like.