The invention discloses a safety evaluation method for an ocean platform based on integration of vibration identification frequencies and a vibration mode. The method comprises: step one, establishing a finite element model with an undamaged structure to serve as a reference finite element model; performing vibration tests to the undamaged structure, and identifying modal frequencies omega di (i=1,..., m) of front m stages and a vibration mode of the undamaged structure to serve as actual measured modal parameters; and evaluating a whole safety state of a service damaged platform structure. According to the method, safety evaluation of a platform structure can be performed directly on the basis of diagnosis vibration test data identification structure parameter definition and safety evaluation parameters, the problem that structural damage diagnosis and safety evaluation of actual engineering structures are difficult in a structural damage diagnosis method based on vibration detection combination is solved; defects that environmental excitation, noise effects and complete measurement effects are large of conventional methods in actual engineering application are overcome; and the method has the advantages that the computational efficiency is high, the applicability is high, the physical significance is explicit, and the like.