The utility model relates to a magnetic eddy current transmission technology field especially relates to an explosion -proof low noise figure magnetic coupler forever, characterized by, including initiative wheel hub, its inboard bonding conductor dish no. 1 that is the integral type structure of the axle sleeve body, the steel disk body and excircle cover body triplex, the steel disk body, the back is connected with load end steel disk to the excircle cover body, forms a semi -closed space between the steel disk body and load end steel disk, load end steel disk's inboard is connected with conductor dish no. 2, the loading wheel hub is including flange and sleeve on it, initiative wheel hub and load wheel hub combination back, semi -closed space is arranged in to the magnet rotor dish. The steel disk body and load end steel disk's the outside is equipped with the silence clitellum. Silence clitellum cross -section be the arc or outer wide in narrow trapezoidal. Its axle sleeve body, the steel disk body and the excircle cover body still can be compared with prior art for the built -up connection structure, the utility model has the advantages that: 1 )The explosion -proof can be good, 2 )The heat dissipation goes with the noise reduction effect, 3 )Supporting various specification model's water pump and fan load.