Transmission line assembly, printed circuit board assembly and electronic equipment

The invention discloses a transmission line assembly, a printed circuit board assembly and electronic equipment, relates to the technical field of printed circuit boards, and solves the problem of large signal loss of a signal line. The transmission line assembly comprises a shielding case and a signal line. The shielding cover is connected with a grounding end; the shielding case is provided with an accommodating space, and the accommodating space is provided with a first opening and a second opening; the signal line comprises a first end and a second end which are oppositely arranged; the signal line is arranged in the accommodating space in a penetrating manner, and a gap is formed between the signal line and the inner side wall of the accommodating space; the first end penetrates through the first opening, the second end penetrates through the second opening, and at least one of the first end and the second end of the signal line is used for being connected with a signal end. As the signal line is located