The accident is occurred more easily in the tunnel section and the accident in the tunnel is difficult to deal with. In order to reduce the accidents in the highway tunnel, ensure the normal running of the mechanical and electrical system is very significant. Completing mechanical and electrical maintenance and strengthening the construction of tunnel electromechanical is one of the important way to reduce accidents. This paper first introduces the components of tunnel electromechanical system, then introduces the development situation and maintenance of tunnel electromechanical system, finally the daily maintenance and management is presented.