The utility model discloses a heat dissipation bottom plate for a notebook computer. The bottom plate comprises a bottom plate main body which is formed by punching a galvanized sheet steel, wherein the bottom plate main body consists of a left plate (1), a right plate (2) and a middle plate (3) positioned between the left and the right plates (1,2); the length of the middle plate (3) is shorter than the lengths of the left and the right plates (1,2); a convex hull is arranged on the middle plate (3), and square abdication through holes (7) are formed in the middle of the end part of an oblique section (9-1) and the middle part of a segmental arc (9-4), of the convex hull; a square through hole (4) is formed in the left side of a vertical section (9-2) , sheet copper convex plates (5) are welded in the right front corner and the left rear corner of the square through hole (4), and the two convex plates (5) are arranged at an interval; screw holes (6) are also distributed in the bottom plate main body. The bottom plate has the advantages of reasonableness in design, simple structure, easiness in implementation, convenience in use, thin product thickness, large heat dissipation area and easiness in assembly.