Connecting device capable of finely adjusting curtain wall up and down

A connecting device capable of finely adjusting a curtain wall up and down belongs to the technical field of curtain wall connection. A connecting rod is arranged in the connecting rod sliding groove between the sliding rack and the sliding rod in a sliding fit mode, the two ends of the connecting rod are fixedly connected to the sliding rack and the sliding rod respectively, and the sliding rack is connected to the sliding rod through the connecting rod. A gear rod is arranged in a rotating shaft hole in a penetrating mode, screwing heads are fixedly connected to the left end and the right end of the gear rod, the gear rod is driven to rotate by screwing the screwing heads, due to the fact that the gear rod is meshed with a rack, the rack is driven to move up and down through rotation of the gear rod, and the bearing capacity of the connecting device is improved. Therefore, the curtain wall connected to the arc-shaped connecting block is driven to move up and down, the curtain wall is adjusted, and the dista