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Aiming at the problems of weak electromagnetic protection measures, laying of cable difficulty and low reliability existing in three-protection signal screen in underground engineering, the research of bus communication technology for signal screen is carried out, and a kind of bus communication card is developed to realize the conversion from hard to soft. The shielding film is applied to the design of the electromagnetic protection of the signal screen. A kind of display screen “sandwich” structure and a whole package process are presented, and the sample is developed. Finally, the overall shielding effectiveness of the shell is tested by three conditions, and the experimental results show that the overall shielding efficiency of the shell is improved remarkably, the shielding shell of single-layer shielding film can reach the third level of electromagnetic protection, and the shielding effect of double-layer shielding film is better.