The utility model provides a gas water-seal heat tracing device with high heat transfer efficiency and belongs to the technical field of galvanizing equipment and the gas water-seal heat tracing device is applied to heating a gas water-seal tank body. The technical scheme is as follows: the gas water-seal heat tracing device comprises two rectangular heat tracing boxes which are respectively arranged on the two sides of the gas water-seal tank body, the shape of one side surface of each heat tracing box is matched with that of the outer sidewall of the gas water-seal tank body, one side surface of each heat tracing box is tightly in contact with the outer sidewall of the gas water-seal tank body, the two heat tracing boxes are respectively provided with a steam inlet and a steam outlet, and the steam inlet and the steam outlet are connected with a steam pipeline. According to the gas water-seal heat tracing device with the high heat transfer efficiency, the heat tracing boxes replace the original steam pipe winding; the sidewalls of the heat tracing boxes and the sidewall of the gas water-seal tank body are matched with in the shape and are tight in contact, so that the heating area of the gas water-seal tank body is maximized, the freezing of the interior of a water seal caused by insufficient heat tracing amount of the gas water-seal tank body is avoided, the parking accident caused by the fact that the gas device cannot regularly discharges water is effectively reduced, meanwhile, the false alarm rate of detection information is reduced, and the cleaning period and service life of the device are prolonged.