The invention relates to a switch cabinet and a shutter mechanism thereof. The shutter mechanism comprises a shutter and a link mechanism for driving the shutter to move up and down, wherein the linkmechanism comprises a first link hinged on the cabinet body and a second link hinged on the shutter, the first link and the second link are hinged with each other, the inner side of the first link isprovided with a driving portion for pushing the circuit breaker handcart of the switch cabinet to drive the rotation of the first link, the first link and/or the second link of the link mechanism is provided with a support portion matched with the inner wall of the cabinet body in a slide support way, and the support portion is close to the hinge of the first link and the second link and away fromthe driving portion and the hinge of the second link and the shutter. When the circuit breaker handcart pushes the driving portion to open the shutter, the support portion is close to the hinge of the first link and the second link and away from the driving portion and the hinge of the second link and the shutter to avoid inclination of the first link and the second link to the outside, thereby avoiding sticking of the first link and the second link.