A convertible nacelle cover with an integrated platform for avoiding the use of auxiliary devices when performing maintenance operations on the components of a wind turbine nacelle, in cases in which the nacelle is not large enough to allow workers to stand on it. The cover has at least two movable parts, which can be opened for maintenance operations, in such a manner that one of them becomes a working platform. Therefore, the nacelle cover is, per se, the place where the operator stands to perform the maintenance operations. It is especially designed to be used in small and medium size wind turbines.