The invention discloses a dry-burning prevention oil bath device, and the device comprises an oil level sensing system. The device comprises a pulley A, a pulley inhaul cable, a buoy (heavy bob), a pulley B, an upper limit magnetic sensitive element, an oil supplementing oil level magnetic sensing element, a safety alert oil level magnetic sensitive element and a sensing magnet, wherein the threemagnetic sensing elements are in butt joint with corresponding oil level sensing interfaces of an electrical control system through signal lines. When the changes of the oil level causes the height changes of the buoy (heavy bob), the position of the sensing magnet is enabled to change. The sensing magnet is aligned with the upper limit magnetic sensitive element in the vertical height direction at different positions, or is aligned with the oil supplementing oil level magnetic sensing element in the vertical height direction, or is aligned with the safety alert oil level magnetic sensitive element in the vertical height direction. The electrical control system is used for transmitting corresponding signals or carrying out the corresponding control. The device remarkably improves the safety coefficient, improves the control quality, and saves the cost.