Abstract: This paper presents an intelligent Multi-Function Switch used in dig working face of coal mine,which be constituted by the main electric circuit and the control electric circuit.The main electric circuit and the control electric circuit is two sets symmetry forms,the control electric circuit takes PLC as core,two sets system is a mutually catena,two sets power supply different power supplies.So,whichever the set of the main electric circuit or the control electric circuit appears a problem;another would be automatic or manual work to insure the dig working face of coal mine has the breeze machine operation.It has credible function.It is easy for us to maintain or replace spare parts when it is working.The intelligent Multi-Function Switch has extensive function.