The utility model relates to an electric heating bag with a pressure relief mechanism.It mainly includes: a bag body,An electric heating mechanism and a pressure relief device；The inner part of the bag is filled with a proper amount of liquid；The electric heating mechanism is arranged inside the bag body.A power supply socket is exposed outside the bag body.It can be used to plug in the power supply and heat the liquid.A vent hole is arranged on one side of the power supply socket to connect the inner part of the bag body；The pressure relief device has an actuating rod.One elastic element and one closed loop,The actuating rod system is penetrated in the vent hole.And it is located in the inside of the bag.The elastic element is sleeved on the outside of the actuating rod.The closing ring is arranged on the actuating rod.And is located inside the bag body and closes the vent hole.A gas channel is arranged in the axial direction of the actuating rod.And an exhaust channel is radially arranged at the end of the gas channel；By compressing the elastic element, the closed ring edge is separated from the vent hole.The exhaust duct is displaced into the bag body.Let the hot gas release out of the bag through the gas channel.一種具洩壓機制之電暖袋，其主要包括：一袋體、一電熱機構及一洩壓裝置；袋體內部填充適量之液體；電熱機構設於該袋體內部，具有一供電插座裸露於該袋體外部，可供插接電源而加熱液體，且該供電插座一側設有一通氣孔連通該袋體內部；洩壓裝置具有一作動桿、一彈性元件及一封閉環，作動桿係穿設於該通氣孔中，且局部位於該袋體內部，彈性元件套設於作動桿外部，封閉環環設於該作動桿，且位於袋體內部並封閉該通氣孔，作動桿軸向設有一氣體通道，且於氣體通道末端徑向設一排氣孔道；藉以壓縮彈性元件而令封閉環緣離該通氣孔，令該排氣孔道位移至該袋體中，讓熱氣經由氣體通道釋放出袋體外部。
