Telescopic protective cage

The utility model relates to a telescopic protective cage, and belongs to the technical field of protective cage equipment in the metallurgical industry. According to the technical scheme, the device comprises an adjusting motor (1), a first combined cage (2), a second combined cage (3), a lateral shielding assembly (5) and an adjusting stud (6), the boundary dimension of the second combined cage (3) is smaller than that of the first combined cage (2), the adjusting motor (1) is fixed to one side of the first combined cage (2), and an output shaft of the adjusting motor (1) is connected with one end of the adjusting stud (6); the other end of the adjusting stud (6) is in threaded connection with the second combined cage (3), the second combined cage (3) is in sliding connection with the first combined cage (2), and a lateral shielding assembly (5) is arranged on the top face of the second combined cage (3). And a storage inner groove (7) matched with the second combined cage (3) is formed in the first combine