To provide a powdered solidifier obtained from sludge without filtration/dehydration or drying by heating, which is economically utilized as a solidifier for soil and is designed in consideration of difference of soil characteristics etc., and to provide a method for producing the same.

The powdered solidifier is composed of a mixture of concrete sludge with an unslaked lime-containing material. Wherein the mixed ratio of the unslaked lime-containing material to the concrete sludge is 0.3-0.7 mol unslaked lime based on 1 mol water in the concrete sludge. The method for producing the powdered solidifier is carried out by mixing the concrete sludge with the unslaked lime-containing material by the ratio of 1 mol water in the concrete sludge to 0.3-0.7 mol unslaked lime, and then the resultant mixture is subsequently powdered.

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