Abstract: [Object] Provided is a steelmaking slag-coated seed and a method for producing the same, which can be produced with less time and effort of a worker and at lower cost, and yet can include a sufficient amount of a uniform coating layer based on steelmaking slag. [Solution] A steelmaking slag-coated seed includes a seed of a rice plant or the like and a steelmaking slag layer formed on an outside of the seed; the steelmaking slag layer is a covering layer made of steelmaking slag powder obtained by pulverizing steelmaking slag; the steelmaking slag contains a prescribed amount or more of calcium relative to all components of the steelmaking slag.