The invention discloses a metal cabin cover for a wind driven generator. The metal cabin cover comprises multiple sub-cover bodies, the sub-cover bodies are formed by welding a thin steel plate and multiple steel frameworks; the edge of the sub-cover bodies are fixedly connected with flange parts, and the flange parts between the adjacent sub-cover bodies which are arranged through opposite ends;multiple rib plates which are distributed in parallel are welded on the inner surface of the cover bodies along the length direction of the cover bodies, the two sides of the end parts of the rib plates are fixedly connected with triangular plates, and the rib plates are fixedly connected with the flange parts at the edges of the cover bodies through the triangular plates; multiple reinforcing plates are further welded to the inner surfaces of the cover bodies along the length direction of the cover bodies, and sealing pads each are arranged between every two adjacent cover body flange parts;and supporting parts are fixedly connected to the left side and the right side of the interiors of the metal cabin cover bodies, and the supporting parts are symmetrically distributed along the lengthdirection of the cover bodies. According to the metal cabin cover, split manufacturing is adopted, mounting and dismounting are convenient, assembly is firm, the strength of the cabin cover is effectively improved, cost is remarkably reduced, and the problems that the composite material cannot be recycled and the like are solved.