The utility model discloses an energy -saving control device of electric welding machine belongs to safe energy -conserving field. Energy -saving control device of electric welding machine includes: solid state relay, trigger controlling means, solid state relay's input and alternating current power supply are connected, solid state relay's output and electric welding power input end are connected, solid state relay's control source with it connects to trigger controlling means. When the electric welding welding is suspend and is restarted, the utility model discloses a trigger controlling means output signal, contact switch -on or disconnection between control solid state relay input and the output have realized the unloaded disconnection in time of electric welding, have avoided the electric welding empty load to cause the potential safety hazard to the staff, have avoided electric welding no -load loss again simultaneously, have saved electric energy esource, the utility model discloses simple structure, installation convenient to use uses with the obvious advantagely.