The present invention includes a modular and removable watercraft platform for providing storage, stability, and mounting means to a user of a PWC. The modular watercraft platform of the present invention is directly for use in fresh and salt water and use with multiples sizes, brands, and types of PWC through multiple adjustment members. The modular watercraft platform allows the user to convert a stock factory PWC to include a front support assembly and a rear platform assembly. The modular watercraft platform allowing for storage, transport, and mounting of various items and accessories, as well as facilitating recreational activities upon the front support assembly and/or the rear assembly.