A kind of safe power supply device of electric warming bag is disclosed, includes a fixture base and a fixture power supply head. The microswitch on road is cut-off in fixture base equipped with a power supply, the first contact of microswitch connects to a power supply line, and fixture power supply head is pivotally connected the what fixture base. Fixture power supply head has one for plug, is connected to the second contact of microswitch, fixture power supply head presses portion for being formed with one on the outside of one of plug pivot end separate. The elastic switch button position what of microswitch presses in the pivotal path in portion, when electric warming bag expanded by heating, by the stretching, extension of fixture power supply head, so that the portion's of pressing pressure is touched to elastic switch button, and then the state for becoming electric power disconnection between the first contact of microswitch and the second contact is enabled, allow electric warming bag to reach the effect of permanent explosion-proof.揭示一種電暖袋之安全供電裝置，包含一夾具底座以及一夾具供電頭。夾具底座內設有一電源開斷路之微動開關，微動開關之第一接點係連接至一電源線，夾具供電頭樞接於該夾具底座。夾具供電頭具有一供電插頭，連接至微動開關之第二接點，夾具供電頭在遠離供電插頭之一樞接端外側形成有一觸壓部。微動開關之彈性開關鈕位於觸壓部之樞轉路徑中，當電暖袋受熱膨脹時，藉由夾具供電頭之伸展，使得觸壓部壓觸至彈性開關鈕，進而令微動開關之第一接點與第二接點之間成為電源斷路之狀態，讓電暖袋達到永久防爆之功效。
