The invention discloses a baffle plate device of a draw out type circuit breaker. The baffle plate device is installed on each phase of the base of a drawer seat. The baffle plate device comprises a sealing plate, a support, a spring and a push rod, wherein the sealing plate, the spring and the push rod are all arranged on the support, the sealing plate is arranged below the push rod and contacts with the push rod, the push rod pushes the sealing plate to open a door, and the push rod and the support are in the same plane when the door is completely opened. The baffle plate device of the draw out type circuit breaker provided by the invention has simple structure and high reliability and is applied to a draw out type circuit breaker of which a bridge type contact is arranged in the body.