A cradle with a door and a door interlock device for a withdrawable vacuum circuit breaker, the door interlock device being configured for automatically preventing the door of the cradle from being opened when a vacuum circuit breaker main body is conveyed to a service position inside the cradle, and the door interlock device comprising: a pressing unit that is provided on one end portion of a shutter lever driving a terminal shutter of the cradle and configured to rotate centering on a lever shaft; a driving force transfer unit that is rotatably or slidably installed on a cradle side frame, the driving force transfer unit configured to perform a rotation or sliding motion by a force applied from the pressing unit; and a sliding member that is configured to lock or unlock a door lock plate in response to a driving force transferred from the driving force transfer unit, characterized in that: the driving force transfer unit comprises: a first connection member that is horizontally slidably coupled on the cradle side frame by being provided with a plurality of horizontal sliding holes (21b, 21c) in which supporting members fixed to the cradle slide frame are slidably inserted, the first connection member being configured to perform a horizontal sliding motion by the force applied from the pressing unit; and a second connection member that is rotatably coupled on the cradle side frame, and has one end connected to the first connection member and the other end connected to the sliding member. a pressing unit that is provided on one end portion of a shutter lever driving a terminal shutter of the cradle and configured to rotate centering on a lever shaft; a driving force transfer unit that is rotatably or slidably installed on a cradle side frame, the driving force transfer unit configured to perform a rotation or sliding motion by a force applied from the pressing unit; and a sliding member that is configured to lock or unlock a door lock plate in response to a driving force transferred from the driving force transfer unit, characterized in that: the driving force transfer unit comprises: a first connection member that is horizontally slidably coupled on the cradle side frame by being provided with a plurality of horizontal sliding holes (21b, 21c) in which supporting members fixed to the cradle slide frame are slidably inserted, the first connection member being configured to perform a horizontal sliding motion by the force applied from the pressing unit; and a second connection member that is rotatably coupled on the cradle side frame, and has one end connected to the first connection member and the other end connected to the sliding member. a first connection member that is horizontally slidably coupled on the cradle side frame by being provided with a plurality of horizontal sliding holes (21b, 21c) in which supporting members fixed to the cradle slide frame are slidably inserted, the first connection member being configured to perform a horizontal sliding motion by the force applied from the pressing unit; and a second connection member that is rotatably coupled on the cradle side frame, and has one end connected to the first connection member and the other end connected to the sliding member.