The invention discloses an RTDS-based (real-time digital simulator) arc protector function test platform which comprises a system platform model, a central control system model, a platform database, and an arc protector. The system platform model comprises a generator sub-model, a double-winding transformer sub-model, a breaker sub-model, a load sub-model, a current transformer sub-model and a voltage transformer sub-model. The central control system model is connected with the system platform model. Configuration files corresponding to all sub-models in the system platform model are stored in the platform database. The arc protector comprises a current unit, a voltage unit, an arc expander, an arc unit, an arc master control unit and an arc probe. The RTDS is introduced, so that the RTDS-based arc protector function test platform is available for offline real-time verification on functions of the arc protector to be tested.