The invention discloses a testing device capable of simulating action behaviors of primary equipment. The device comprises an intelligent processing module, a full-model type SCD parsing module and a primary equipment simulation module, wherein the intelligent processing module is connected with the full-model type SCD parsing module, control commands and state information are received and transmitted through MMS messages, the full-model type SCD parsing module is connected with the primary equipment simulation module to construct and simulate corresponding relations of primary states and the model of SCD, so tests on consistency functions of a simulation system and operation equipment are realized, the primary equipment simulation module accomplishes on-load voltage regulation behavior states of a breaker, a disconnecting link and a transformer, and correctness tests on monitoring software are accomplished. Site test problems of monitoring software of intelligent transformer stations in the prior art are solved, and necessary conditions are provided for upgrade of the monitoring software and tests after upgrade.