A protective case of a folding screen mobile phone includes a front protective case, a rear protective case, a soft connecting mechanism and a hinge protector. The front protective case is provided with a transparent window or a hollow-out window. One end of the soft connecting mechanism is fixedly connected to the rear protective case, another end of the soft connecting mechanism is connected to one side of the hinge protector, and a hinge positioning mechanism is provided between another side of the hinge protector and the front protective case; or, one end of the soft connecting mechanism is fixedly connected to the front protective case, another end of the soft connecting mechanism is connected to one side of the hinge protector, and a hinge positioning mechanism is provided between another side of the hinge protector and the rear protective case.