Water and electricity separated hand warmer

The utility model provides a water and electricity separated hand warmer and a charging device thereof. The hand warmer comprises environmental protection mercerized cloth, wherein the environmental protection mercerized cloth is located at the outermost layer. The lining of the mercerized cloth is provided with two PVC layers. The surface layer of the mercerized cloth is provided with a power interface. A temperature control fuse is arranged below the power interface, that is, the temperature control fuse is arranged inside the water and electricity separated hand warmer. The water and electricity separated hand warmer is internally provided with an alloy heating tube. The alloy heating tube is connected with the power interface. The alloy heating tube 3 is coated with an insulation layer. The charging device is a U-shaped charger. The U-shaped charger comprises a base and a handle. The handle and the base are rotatably connected. A hole power source is arranged below the top end of the handle, and an indicator light is arranged above the handle. The three safe protection layers have anti-explosion performance. The power interface is provided with a safe back screw cover, electric elements can be protected, the hand warmer is safely protected, and the service life of a water and electricity separated hot water bag is ensured to be prolonged. An electric heated tube is provided with an overheating protection device to avoid damage or water leakage of the hot water bag caused by dry heating.