Energy-saving device for gas stove

The utility model discloses an energy-saving device for a gas stove. An upper connecting tube and a lower connecting tube are connected into integration, a spring is sheathed on the outer side of the lower connecting tube, and the lower end of the lower connecting tube is connected with an oil-resistant rubber pad and is arranged in the inner cavity of a triple valve body via a fastening cap nut; the upper and the lower connecting tubes can carry out the reciprocating movement in the vertical direction and the rotary movement; the stainless steel tube whose inner cavity is provided with a strong magnetic loop is connected with the triple valve body; a changeable joint is connected with the triple valve body. The utility model can open or close a valve automatically and can magnetize flammable gas, and the flammable gas can be fully burnt, the air pollution is reduced, and the fuel can be saved.