Concrete core drilling machine

The utility model discloses a concrete core drilling machine which comprises an equipment main body, a movable seat is arranged in the equipment main body, a drill rod is arranged on one side of the movable seat, mounting plates are fixedly mounted at two ends of one side of the movable seat, when the equipment main body moves to a use position, the movable seat moves downwards, and when the movable seat moves downwards, the mounting plates are fixedly mounted on the equipment main body. The dustproof cover and the drill rod are driven by the movable rod to move downwards, the dustproof cover is lower than the drill rod, along with movement of the movable seat, a sealing ring at the lower end of the dustproof cover makes contact with the ground, the sealing ring drives an insertion ring to move towards the interior of the dustproof cover, a movable ring moves upwards, a supporting spring is compressed, and the sealing ring is driven by the supporting spring to rotate. The dust cover is tightly attached to the