The present invention relates to a door interlock device for a vacuum circuit breaker, and more particularly, a door interlock device for a vacuum circuit breaker, which is operable in cooperation with an operation of a cradle shutter. A door interlock device for a vacuum circuit breaker according to one embodiment disclosed herein includes a pressing unit (16) that is provided on one end portion of a shutter lever (15) driving a terminal shutter of a cradle, a driving force transfer unit (20) that is rotatably or slidably installed on a cradle side frame, the driving force transfer unit performing a rotary motion or a sliding motion by a force applied from the pressing unit, and a sliding member (30) that is configured to lock or unlock a door lock plate (55) in response to a driving force transferred from the driving force transfer unit.