Knuckle bearing and milling excavator using same

The utility model belongs to the technical field of rectangular pipe jacking machines, and particularly relates to a knuckle bearing and a milling excavator using the knuckle bearing, the knuckle bearing comprises an outer ring and an inner ring, the outer ring is provided with a connecting structure used for being connected with a frame body of the rectangular pipe jacking machine, and the knuckle bearing is characterized in that flange plates are arranged at the end parts of two connecting arms; wherein one flange plate is used for being connected with a swing mechanism of the milling and excavating machine, the other flange plate is used for being connected with a milling and excavating head of the milling and excavating machine, and an avoiding annular groove used for avoiding the outer ring and the frame body is defined by the flange plates, the connecting arms and the inner ring. The inner ring is provided with the connecting arm, and the end part of the connecting arm is provided with the flange plate