The present invention provides a display screen, a mobile terminal having the display screen, and a modular terminal device composed of a plurality of the mobile terminals. The modular terminal device includes a plurality of the mobile terminals spliced together. The display screen includes a hard display screen connected to a main body and a flexible display screen connected to the hard display screen. The flexible display screen protrudes from the main body. The flexible display screen includes a first flexible display screen and a second flexible display screen. A first fold line is formed between the first flexible display screen and the second flexible display screen. The flexible display screen is foldable along the first fold line. The display screen of the present invention can be expanded according to the usage requirement when in use and can be folded up when not in use.