The invention relates to a clamping device. The clamping device comprises an installation plate module, a clamping module arranged at a bottom end of the installation plate module and an auxiliary grabbing device arranged at one end of the installation plate module; the installation plate module comprises a first installation plate and a second installation plate arranged at one end of the first installation plate; the clamping module comprises a first sucking disc device and a first pressing block device which are respectively arranged at the bottom end of the first installation plate, and a second sucking disc device and a second pressing block device which are arranged at a bottom end of a third installation plate and correspond to and are cooperatively used with the first sucking disc device and the first pressing block device. The clamping device provided by the invention has the beneficial effects that the first sucking disc device and the second sucking disc device are arranged and used for grabbing an air conditioner indoor unit face frame; the first pressing block device and the second pressing block device are arranged and used for holding a top end of the air conditioner indoor unit face frame; the auxiliary grabbing device is arranged and used for grapping the air conditioner indoor unit face frame in an auxiliary manner.