The invention belongs to the technical field of parallel robot experiment devices, particularly discloses an experimental device assembly system for a reconfigurable parallel/hybrid mechanism, and aims at solving the problems that an existing reconfigurable robot is limited in reconfiguration variety and invariable in size. The experimental device assembly system comprises a connecting rod assembly, a motion pair assembly and a mobile/fixed platform assembly and a transition connector assembly, wherein the motion pair assembly comprises a rotation pair assembly, a moving pair assembly, a hook joint assembly, a spherical pair assembly and a cylindrical pair assembly; standard interfaces for connection are arranged in the tail ends of the assemblies; and the assemblies can be freely combined. Different motion branch chains are formed through connection of different assemblies; and the motion branch chains are connected to the mobile/fixed platform assembly to form the required parallel/hybrid mechanism. Various assemblies can be conveniently dismantled and can be reused, the accuracy of experiment device assemblies is not changed, the cost is reduced, the innovative design requirements of a parallel/hybrid mechanism body are met, and the experiment research period of comparing the properties of different parallel/hybrid mechanisms is shortened.