Full-hydraulic double power head device of rotary drilling rig

The utility model relates to a full-hydraulic double power head device of a rotary drilling rig. The full-hydraulic double power head device comprises a carriage, an inner-side power head for driving an auger stem and an inner-side power head for driving a sleeve, wherein the inner-side power head and the outer-side power head are both fixed on the carriage. The rotary drilling rig with the double power head device provided by the utility model is improved in construction efficiency, can achieve construction methods such as CFA, CFG, steel pipe piles and continuous walls, and overcomes the problems that the existing rotary drilling rig in the prior art is large in size of power head, single in construction method and low in comprehensive construction efficiency.