The invention relates to a shielding case, a touch finger assembly using the same, and a circuit breaker. Therefore, a problem that the amplitude of an elastic contact plate is large after a corresponding contact is drawn out in the prior art can be solved. In order to solve the problems, a limiting structure is process on the upper side of the shielding case; when the shielding case is in use, a suspending and extending end of a touch finger is arranged between the limiting structure of the shielding case and the inner wall surface of the shielding case; and after a contact inserted into the touch finger is drawn out, the inward displacement of the suspending and extending end of the elastic contact plate along a radial direction can be limited by the limiting structure and thus an effect of limiting an inward maximum deformation of the elastic contact plate is realized. Therefore, the mechanical vibration amplitude and oscillation time of the elastic contact plate can be reduced effectively; and the service life of the touch finger is prolonged.