The utility model discloses a supporting device of jumbo size casing tong, including rotary table assembly and binding clip assembly, rotary table assembly includes gear wheel and last holding down plate, and the binding clip assembly includes that main binding clip, vice binding clip and climbing roll. Rotary table assembly is 26 inch at least rotary table assembly, and the binding clip assembly is 26 inch at least binding clip assemblies, wherein, rotary table assembly is that gear turntable is surrounded to the syllogic, and rotary table assembly is constructed to be in at least the modulus of gear wheel and the number of teeth and with the general exchange of the rotary table assembly of conventional form casing tong in the aspect of the direction external diameter of going up the holding down plate and the thickness size, and the binding clip assembly is constructed in the aspect of outward appearance and atress unanimously with 16 inches binding clip assemblies of conventional form casing tong. The utility model discloses can be perfect supporting with conventional form casing tong, functional, can be used for the operation of breaking out on the jumbo size sleeve pipe to the cost is reduced.