A large data device includes a connector base and a connector head connected to the data device, A right sliding cavity with a slot opening is arranged in the left and right extension of the couplingseat, A first sliding groove is symmetrically arranged in the upper and lower end walls of the sliding cavity, A communication groove is arranged between the first sliding groove and the sliding cavity, A first sliding block is slidably mounted in the first sliding groove, the first sliding block is provided with an expansion groove with a groove opening toward the communication groove, A bevel lock block penetrating through the communication groove and protruding into the sliding cavity is slidably installed in the telescopic groove, A first rotating groove is arranged in the end wall of thetelescopic groove remote from the communication groove, a first rotating pin shaft is rotatably installed in the left and right end walls of the first rotating groove, a rotating drum is fixedly arranged on the first rotating pin shaft, a steel wire rope is rarely arranged on the rotating drum, and an end of the steel wire rope remote from the rotating drum is fixedly connected with the inclined lock block.