The utility model discloses an uncontrollable DC ice melting device, including rectification cabinet and switch board, the rectification cabinet sets up the independent hot air duct of loosing, has promoted the radiating effect of device, satisfies big current level's requirement, improve insulating effect to this electric pressure that improves the device, through setting up alarm system in the switch board, detect temperature in voltage, electric current, the cabinet etc. Provide the guarantee for device safety, reliability service. The utility model discloses high tension transmission line's ice -melt work can be be applied to, for the user provides efficient ice -melt equipment, the requirement of long distance line ice -melt satisfied.