The invention discloses a service performance beforehand experiment platform of a future fusion reactor divertor part. The platform includes a drive assembly, a support assembly and an experiment part assembly. The drive assembly is externally connected to the bottom part of a lower window neck tube and provides vertical movement to the support assembly and the experiment part assembly and includes a support desk, a driver, a stepping motor, a coupler and a spiral elevator. The support assembly is in the lower window neck tube and includes a baffle, a corrugated pipe, a flange, a support main shaft and an auxiliary support. The experiment part assembly is in a vacuum chamber lower divertor area and includes the divertor part and a support body thereof, a support frame and a cooling pipe. During a service performance experiment is carried out, the platform accurately transports experiment parts to a standard divertor position and if the experiment parts are damaged, the experiments can be removed from the standard divertor position so as to be far away from a plasma and thus normal discharge operation of the plasma is not affected; and the system is adaptive to demands of carrying out of a service behavior beforehand experiment on divertor parts with different structures and technologies.