The utility model discloses a covered transformer low tension cable fixing device, including the low tension cable case, the low tension cable incasement is equipped with at least one deck fixed supported slab, the support pole setting has been arranged on the fixed supported slab, it corresponds the flexible cable clasping loop of fixed mounting to support the pole setting top, one side of elasticity cable clasping loop is equipped with and makes things convenient for the cable business turn over opening in the elasticity cable clasping loop, it demolishs booster unit to be equipped with thecable that the cable of being convenient for demolishd in the elasticity cable clasping loop, the elasticity cable clasping loop outside corresponds the cable is demolishd booster unit and is equippedwith helping hand locking device, the utility model discloses utilizing fixed supported slab, elasticity cable clasping loop and supporting the pole setting and fix the cable, can effectively improveand fix efficiency and reduce use cost to the low tension cable, helping hand locking device's release has an outside thrust to the cable, and demolising fast of the cable of being convenient for isused more laborsavingly.