Assembled blackboard

The utility model particularly relates to an assembled blackboard which comprises blackboard bodies and a fixed rack. The fixed rack is movably connected with two connecting rods which are vertically fixed. The ends of all the connecting rods are connected with the blackboard bodies respectively, and each blackboard body is provided with an annular sliding groove. A first guide bearing which is connected with the corresponding blackboard body through a guide shaft is embedded in each annular sliding groove. Angular guide grooves are further formed in the fixed rack, the free ends of the guide shafts are further provided with second guide bearings which are embedded in the annular guide grooves, and each blackboard body is further provided with a locking device. The backboard bodies rotate by 360 degrees under the effect of the connecting rods and the annular guide grooves, it is guaranteed that all the blackboard bodies can be effectively utilized, shielding and interference of a projector are avoided, teachi