The invention belongs to the field of hydraulic power testing and in particular relates to a multifunctional towing tank testing platform which comprises a fixed platform (1), a lifting platform (2),top beams (3), diagonal shores (4), a lifting system, a sliding track system, wedge blocks (11) and a group of guide track (12). By adopting the platform, the problem that a common towing tank is single in testing capability is solved, meanwhile the time cost of replacing testing platforms is reduced, a base is made for future high-grade, precision and advanced testing projects beyond mediums andcross fields, and various large-size testing can be supported.