A boat protective extension platform apparatus for use in connection with watercraft lifting platforms is provided. The extension platform is preferably attached to the stern of a boat and serves to at least partially cover a gap created between the boat and the lifting platform when the lifting platform is in a lowered position. The extension platform can include a retractable screen that is removably attachable to the lifting platform such than when said screen is extended, the aforementioned gap is further covered, thus preventing items carried by passengers and crew from falling or rolling into said gap and being lost or damaged.