The invention discloses a device used for mounting training of cable terminals. The device comprises a plurality of sets of cable terminal mounting stations, the plurality of sets of cable terminal mounting stations are sequentially spliced to form a polyhedral structure, and mounting brackets of the plurality of sets of cable terminal mounting stations are fixedly connected; and terminal mountingsides of the cable terminal mounting stations are arranged outside, and the back sides of the terminal mounting sides are arranged inside for shared use. The device can be used for simulating the mounting condition in the practical project, the four sets of training stations surround from four sides to be combined together, and realize supporting and fixing among each other, then additional standcolumns or other support structures are not needed, meanwhile, during training, the terminal mounting sides used more frequently are arranged on the outer side, while the back sides used less frequently are arranged on the inner side for shared use, therefore, the place is saved, in addition, trainees of the four sets of terminals can be trained simultaneously in one group, the random moving is available, the firm stabilizing is also available, the centralized training is realized, and thus the implementation of grouped evaluation is facilitated.