Double-wheel groove milling device and double-wheel groove milling machine

The invention relates to the technical field of underground construction equipment, in particular to a double-wheel groove milling device and a double-wheel groove milling machine. The double-wheel groove milling device comprises milling wheels, a first driving device driving the milling wheels to rotate and a rotating mechanism; the first driving device comprises a hydraulic motor, a small chain wheel arranged at the output end of the hydraulic motor and a large chain wheel connected to the small chain wheel through a chain, wherein the milling wheels are connected to the large chain wheel through first connecting shafts; and the rotating mechanism comprises a rotary milling cutter used for milling the area below the large chain wheel and a second driving device driving the rotary milling cutter to rotate. According to the double-wheel groove milling device and the double-wheel groove milling machine, the technical problem that dead milling zones occur in the milling process of the double-wheel groove millin