A scour preventive block for a bottom of river is provided to improve resistance against scour by covering a cover on a body and putting some kinds of aggregates in a mesh and filing the mesh in the body. A scour preventive block for a bottom of river comprises a body(10), a cover(20), a through hole(13), a mesh(40), a slide groove(15), and a connect sill(21). An aggregate(30) is received in the mesh. The mesh is placed in the body. The side part of the slide groove is opened. The slide groove is formed at an upper part of the body. The connect sill connected with the slide groove is formed at the cover.
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