The utility model provides a sun-shading device for tobacco seedling raising. The sun-shading device for tobacco seedling raising comprises a base and a first fixing column, wherein the first fixing column is fixedly mounted at the top of the base; the second fixing column is fixedly mounted at the top of the base; the first connecting rod is rotationally mounted on the outer wall of one side of the first fixing column; the second connecting rod is rotationally mounted on the second fixing column; the two limiting grooves are formed in the ends, close to each other, of the first connecting rodand the second connecting rod respectively; the two limiting screws are respectively arranged in the two limiting grooves; and the rotating rod is arranged between the first fixed column and the second fixed column. The sun-shading device for tobacco seedling raising has the advantages of being easy to operate and convenient to disassemble and assemble.